Seems that too often, aftermarket companies couldn`t be bothered to make things fit properly. I have a buddy that is a retired bodyman, who has restored dozens of 65 thru 70 Mustangs, and 57 Ford cars, and some of the stories he has told me over the years, and having seen how poorly many replacement sheet metal body panels fit the intended car, is quite troubling. He showed me 57 Ford front fender headlight bucket repair panels, they have wrinkles, don`t come close to following the contours of the fenders, and are made too short , so a piece has to be fabricated, and welded in, to fill the space. Same with much of the replacement 1/4 panels, doors, fenders, hoods, etc, wouldn`t it seem that if you are going to make such parts, that making them fit at least somewhat accurately , is a consideration? Same like new cylinder heads that need the guides honed, a valve job, decks surfaced, new blocks that need to be align honed, decks straightened, and lifter bores sized, connecting rods that needed to be sized at both ends, crankshafts that are out of round, etc, Wouldn`t it be nice if a shiny new parts was usable "out of the box"? Seems like all this new technology , modern machining stations, and such advances has often produced parts that don`t fit as well as they used to, 30-40 years ago.