Not sure if this has been posted before or not, I couldn't find anything. But on my car it's a Sport Coupe with GFX, the nose is from an IROC. Well I took off the bumper cover today and looked at the absorber pad. On the far left hand side I noticed it said Z28 on it. I'll post a picture here in a few minutes once I go back out there and take a picture. But it struck me as odd cause I figured all absorber pads were the same, whether they were for a regular Camaro, Sport Coupe, Z28, etc.
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http://img.photobucket.com/albums/v1...W/IMG_5591.jpg

That's the picture.

 

i think they prob all had that stamped on there..... ive seem about 5 91 rs's with front liscence plate holders that say z28 on them as well..... prob just a general stamping.....correct me if im wrong...