I have a set of 68 NOS GM fenders, or, as I beileve. How can you tell the difference from GM to the repos. When I bought these, he told me they were GM but the e-coat was stripped off on the inside, NO STICKER. He planed on stripping both sides but stopped after he did the inside. The hood hinge nuts are T style, they weigh 29 pounds without extensions, each inner frame support has a # stamped in it Right is: 38, Left is: 42. The stampings and folds are tight and crisp and they are not drilled for emblems yet. I am going to try to sell these and want to make sure they are what they are.