It has to do with your hub size upfront.. older s-10's have a thicker hub than newer ones, what you can do is get a dremel and take a little material off the center bore of the wheel to make them fit. It will not cause a balance problem like some people think.
heres what to di..i did this when i installed my xtreme wheels, go to autozone and rent an engine honer from there loan a tool deal. install it on a drill and bore out the center. The engine honer keeps everything nice and circular while maintaining the balance of the rim.
How could the center hole have anything to do with balance.The rim sets on the wheel studs the same way no matter what.The center whole has nothing to do with the wheels rotating mass.Just bore it out enough to let it set on the hub with out having to force it on.
HAHAA..I got mine on, just crank the nuts enough and it'll shim out the metal..hehe. No really afterwards I had a sledge hammer take them off..hehehe, then had them bored out properly. They'll work if you do it.