I belive they are aftermarket but identical to a NOS amber one I have in a GM box in every way. They both have the same SAE-23 markings, lettering, quality fit & finish. The red ones do have a extra letter in the part number though. I bought these from a guy in Arizona who had them lying around in his garage. I thought these were amber ones, but they ended up red. They looked amber in the eBay photo in his auction. Let me know if you are still interested as I can't guarantee them to be official GM as they have no box.
Mitch
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Mitch
1978 Chevrolet Silverado C 10
454 BB, TH400
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