hello,i have an05 grand prix gt with 16x6.5" polished alum.wheels.i have a set of 16x7" chrome rims.i went to goodyear to have the rims mounted but they would'nt fit flush against the hub.i have heard of hub centric rings and adapters to solve this problem.can anyone give me some info on this?thanks,joe

what exactly do you need to know?

hub centrics are simply plastic spacers

usually aftermarket rims come with them...