those wheels are probably designed for late model cars that don't have the dust caps- Camros, Firebirds, etc. if you are dead set on using those wheels, you could get some wheel spacers to kick the wheels out enough for the caps to clear, but then you are getting into longer studs and what not. or you could get the later model S10 spindles that use the integrated hub/bearing assembly and 2 piston calipers- but that seems like an expensive way to make a set of wheels fit.
or maybe they have a different center cap for the wheels that will clear your dust cap- but i'm sure they won't exactly give those away, either.