Hy Jaredm, the front hub seal was originally a felt, some seal manufacturers list a rubber type replacement some don't, I can't find a parts book that lists a rubber replacement for a 16 series 1948 Chevrolet Maple Leaf (2 1/2 ton truck) but if you disassemble and give us the I.D., O.D., and thickness we should be able to find a seal for you. The rest of these are O.E.M. numbers crossed to Napa numbers
Pinion seal O.E.M. 2082925 = Napa NOS 20098
Inner rear hub seal O.E.M. 5830526 = Napa NOS 33306
Transmission output seal O.E.M. 591448 = Napa NOS 22336
Hope that helps.
