I found a nice 1950 F4 & F6 trks and I'm not sure if the fenders, cab, etc are the same as a '50 F1 pu.
cabs hoods and doors are the same F-1 and up. Fenders for F-1 are for F-1's only. http://www.fatfenderedtrucks.com/partsinterchange.html
F-2 to F-6 fenders are presentable on a F-1, the wheel well is bigger but not too bad. If you look close, one of the restored F-1s in the book Classic Ford F Series Trucks 1948-56, actually has F-2 style fenders.