I was thinking that too... Both front fenders have white paper labels (1" x 2")that are attached where the hood hinges mount (under the hood hinges), they are not legible but that is all I can find (one almost looks like it sais "General Motors" but not sure it's very faint). Does this sound like stock fenders ? Keep in mind, I've owned the car 15 years and before that it sat in my neighbors garage for 10 years untouched, so if they are aftermarkets they would be 25+ years old. It is possible though, I recall he was racing the car down the street when we were kids and he hit the island at the end of the street, I'm not sure it damaged the fenders, I need to track him down to get some history on it.. maybe they did a real good job patching it, but I won't know until I get ready to do the body work and strip that area.