How to tell if body part is OEM

badazz81z28

Veteran Member
May 4, 2001
22,366
Alabama
1979 Z28, torn down to a stripped tub. How do you know if a fender is an oem GM stamped product?


Most situations, you can tell by the nuts. A OE fender will have rectangular nuts for the inner fenders. Repop has what looks like normal nuts. The OE fenders also have the crash crinkles where the hood rest when it’s lowered
 

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Burnttoastburgos

Veteran Member
Jan 22, 2019
214
Colorado
ok, now i know what to look for. I looked at every interior plastic part for a GM stamp, some had them some did not. Arent the interior parts all identified with something that says GM?

thnx
 

badazz81z28

Veteran Member
May 4, 2001
22,366
Alabama
ok, now i know what to look for. I looked at every interior plastic part for a GM stamp, some had them some did not. Arent the interior parts all identified with something that says GM?

thnx


Not all GM parts have part number stamping, but a lot of them do. I don’t recall ever seeing “GM” on anything.
 

severum17

Member
Sep 5, 2001
96
South of Dallas TX
No, but you should see the GM part number and mfg. info molded on the backs of the plastic parts
There should be some type of molded in numbers or GM on the interior parts. Most numbers are 1 off of the part number. Dont ask why,nobody knows. I am a GM retired Parts Manager for many years and could never understand why if you put a number on it , why its not the part number but its not. There is a chart in the parts books to convert the casting number to parts number.
 

COPO

Veteran Member
Lifetime Gold Member
Sep 15, 1999
22,300
Ontario, Canada
In other words, non OEM or aftermarket is Chinese made garbage that doesn’t fit. BTW OEM means original GM part.
 




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