The core supports are quite different between body styles so you will need a bullnose one. Also, 1980-1984 gas engine trucks used one type, and 1985-1986 gas trucks used a different type (diesels were different also). The difference in the two gas engine core supports was how the radiator mounted, so consider which radiator you have and want to mount before buying the core support. Welcome to the group!
SHORT BED 4-DOOR DIESEL: 1986 F350 4x4 under construction-- 7.3 IDIT ZF5+GVOD
STRAIGHT SIX 4X4: 1981 F150 2wd to 4x4-- 300 I6 close ratio diesel T19, hydroboost brakes, Saginaw steering
BIG F: 1995 F-Superduty under construction— converting to 6.9L IDI diesel ZF5+DNE2