neighbor just got finished doing a 69 for someone I know - used a variety of aftermarket tin [not GM] and everyhting was #1 fit and shape and weight - door sills/rockers, cab corners, front and rear fenders and step-boxside - I think made by Dynacorn, who do most of the 55 up patch panels and everything I've seen from them is perfect - ask who the non-GM parts are from
Bill