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Brutus,
L-88/ZL-1 "flares" were sold "over the counter" and not factory installed. I believe the ones in your pic are not GM as they have too much material at the rear, factory flares tapered in to the body much more. The GM flares would also have a part number glassed in on the back side if you can get under and look. ...redvetracr
I know there was sets of flairs sold by dealer over the counter but I can't say if those are the ones or not. Joni (aka. bowtie racing) had this beautiful 69 coupe and he said the flairs on it had a GM part numbers!? Please Joni correct me if I'm wrong here... Anyways I think the flairs looked great on his car as well as on the blue one.