fuel filler doors
Part numbers for the fuel filler doors, called Door Assy. (Fuel Filler Opening) by Ford, used on the Bullnose trucks. To summarize, the Styleside trucks and Broncos used one door (E3DZ 54405A26-A) and the Flareside and dual rear wheel trucks used another (E7TZ 83405A26-B). But, note that the latter part was replaced by E8TZ 83405A26-A which was used on 1988 and 1989 trucks with dual rear wheels - and maybe later although I can't tell because my catalog ends as of 1989.