S430 16inch alloy on a C240

 I have a 2001  c240 and my brother gavce me his 2002 s430 amg 16inch alloy wheels. What size of bolts do i need and stuff i know nothing and do i have to get them from the dealer bewcasue  i will. Does anyone know what i need to do to get thoes wheels on becaasue when i broguht it in the guy said my bolts are too short. \

Thanks everyone