You mean the ones w/ the filler neck sticking out??? i think it was 73-77-8 IIRC . I think personally it makes for a cleaner look w/ the gas door rather then the filler neck sticking out... Or if you want just do what i did, buy a stepside fender w/ the gas door, remove it and put a piece of sheetmetal in there, weld it up and smooth it out....
thanks
pat