kbohrer

I am looking to replace the rusted bolts on my 2002 C230 Coupe. I have the stock 16" wheels, not the C7 17" wheels. I checked with the dealer and they want $10 per bolt which would be $200 for all 20 bolts. Is there a reputable "aftermarket" bolt, and if so what are some good sources? Also, what are the specs I need (i.e. ball vs cone seat, mm width, mm length, etc).

Thanks in advance!