OEM reference numbers are useful when sourcing aftermarket auto body parts because they give buyers and suppliers an additional way to identify the required component. However, an OEM number should not be treated as the only purchasing criterion.
For importers, distributors and automotive parts buyers, reliable product identification usually requires several pieces of information to be checked together: vehicle model, model year, part type, installation side, material, product configuration and available reference numbers.
Most importantly, an OEM reference number used on an aftermarket product does not mean that the part is an original, genuine or officially authorized OEM component. It should be treated as a reference for product identification unless otherwise verified.
What Is an OEM Reference Number?
An OEM reference number is a number associated with a vehicle manufacturer's original part identification system.
In the aftermarket supply chain, these numbers are often used as reference information to help buyers and suppliers determine which replacement part corresponds to a particular vehicle application.
They can be especially useful when:
different parts have similar names;
several model years use visually similar body panels;
left-hand and right-hand parts need to be distinguished;
buyers manage large catalogs across multiple vehicle models;
purchasing teams need a consistent reference for repeat orders.
However, the number is only one part of the identification process.
A replacement body panel should still be checked against the intended application before an order is confirmed.
An OEM Reference Number Does Not Mean “Genuine OEM”
This distinction is important for aftermarket purchasing.
A supplier may list an OEM number to indicate the original part that an aftermarket replacement is intended to correspond with.
That does not automatically mean the replacement part:
was manufactured by the vehicle brand;
comes from the original vehicle manufacturer's supply chain;
carries official authorization from the vehicle manufacturer;
is a genuine or original factory part.
For this reason, B2B buyers should distinguish between:
OEM reference number
and
Genuine / Original OEM part
when reviewing quotations and product catalogs.
Using clear terminology helps reduce misunderstandings between buyers, suppliers and downstream customers.
Always Confirm the Vehicle Model and Year
An OEM number is useful, but the vehicle application should still be checked.
Buyers should provide the exact:
Vehicle manufacturers may update body designs, mounting arrangements or component configurations between model years.
Two parts can have similar names and similar overall appearance while being intended for different applications.
For this reason, buyers should not rely on a general description such as:
“Chevrolet Hood”
or:
“Buick Fender”
when requesting a quotation.
A more complete request helps both parties confirm the intended part more efficiently.
Confirm the Exact Part Type
Another common issue in aftermarket purchasing is relying too heavily on a reference number without clearly identifying the part itself.
The inquiry should state whether the buyer requires a:
This becomes particularly important when a purchasing team handles hundreds of references across several vehicle brands.
A clear part description provides a second identification point if a number is entered incorrectly or interpreted differently.
Check LH and RH for Side-Specific Parts
For many automotive body parts, the installation side is essential.
Typical examples include:
The buyer should confirm whether the requirement is:
LH — Left Hand
RH — Right Hand
or both sides.
An OEM reference may differ between LH and RH versions.
If only the vehicle model and part name are provided, the quotation can still be incomplete.
For repeat orders, it is useful to keep side information consistently recorded in purchase orders, inventory systems and internal product codes.
Material Can Be Another Important Identifier
Some replacement body parts may be available in different materials for different applications or versions.
For example, a hood may be produced in iron or aluminum depending on the vehicle application and product specification.
In this situation, a buyer should not request a part based only on the general vehicle name.
The inquiry should confirm:
intended vehicle application;
required material;
model year;
relevant product reference;
any configuration differences.
This is particularly important for importers managing both material versions within the same product category.
Product Configuration May Matter Even Within the Same Model
Reference numbers should also be considered together with physical product configuration.
Some body panels may have variations such as:
different hole configurations;
different stamped features;
different mounting arrangements;
sedan versus coupe applications;
pre-facelift versus facelift versions;
regional vehicle differences.
A product photo can help, but appearance alone is not sufficient for final identification.
Where several versions exist, buyers should use as many reference points as possible before placing a bulk order.
Cross-Check the Reference With Product Photos and Drawings
For a new product application, buyers can reduce identification risk by comparing the OEM reference with available visual or dimensional information.
Depending on the product, useful verification materials may include:
This does not mean every order requires detailed engineering drawings.
The objective is simply to avoid relying on a single identifier when several practical confirmation methods are available.
Be Careful With Superseded or Multiple Reference Numbers
In automotive parts catalogs, a single application may sometimes be associated with more than one reference number.
This can happen when a number is updated, replaced or cross-referenced over time.
For B2B buyers, multiple numbers should not automatically be interpreted as different products.
Likewise, two similar products should not automatically be treated as interchangeable because their reference information appears related.
When multiple references are available, buyers should confirm which application and product configuration are actually required.
If there is uncertainty, sample verification or additional product information may be more reliable than making assumptions based only on the number.
Keep OEM References Consistent in Repeat Orders
OEM references become especially valuable when they are used consistently across the purchasing process.
For repeat sourcing, buyers can record:
This helps purchasing teams avoid depending on personal memory or informal product descriptions.
It also makes communication easier when staff, suppliers or warehouse personnel change.
For distributors with a growing aftermarket body parts catalog, structured product identification can reduce confusion across repeat orders.
Should Buyers Request Samples?
For an established product that has already been purchased and verified, repeat orders may follow an existing inspection process.
For a new vehicle application or a new product version, sample verification can be useful before larger-volume purchasing.
A sample may help confirm:
A sample should not replace accurate product information, but it can provide another verification step when the purchasing risk is higher.
What Information Should Buyers Send With an Inquiry?
To make aftermarket body parts inquiries more efficient, buyers should provide as much relevant identification information as reasonably available.
A useful inquiry may include:
vehicle make and model;
model year or year range;
required part name;
LH or RH where applicable;
material if relevant;
OEM reference number if available;
product photo or sample information where necessary;
required quantity;
packaging requirements.
If the OEM reference is unknown, buyers can still send the vehicle and part information first.
If the vehicle information is uncertain, an OEM reference plus clear product photos may help the supplier narrow down the correct application.
The strongest identification usually comes from combining multiple pieces of information rather than relying on only one.
Frequently Asked Questions
Can I order an aftermarket body part using only the OEM number?
It is better to provide the vehicle model, year and part name as well. An OEM reference is useful for identification, but additional application information helps reduce the risk of selecting the wrong product.
Does an OEM reference number mean the replacement part is genuine?
No. An OEM reference number can be used to identify the corresponding application, but it does not by itself mean that an aftermarket part is genuine, original or officially supplied by the vehicle manufacturer.
Why can one product have more than one OEM reference?
Reference numbers may change or be cross-referenced over time. Buyers should confirm the actual vehicle application and product configuration instead of assuming that each number represents a completely different part.
What should I do if I do not know the OEM number?
Provide the vehicle make, model, year, part name, side where applicable and any available photos or sample information. These details can still be used to help identify the required replacement part.
Source Aftermarket Body Parts With Clear Product Identification
For B2B aftermarket purchasing, OEM reference numbers are valuable identification tools, but they work best when combined with accurate vehicle and product information.
Before confirming an order, buyers should check the vehicle model, model year, part type, installation side, material and product configuration as applicable.
When contacting Deerma for automotive body parts, buyers can provide the vehicle model, required part, OEM reference number where available and purchasing quantity so the product application can be reviewed before quotation.
WhatsApp
Phone
Email
Message
Comment
（0）