hey, Most places that sell sports wheels will tell you what boss kit you need... ADVICE!!!! don't do it the other way around.... get the wheel first and take it with you when you go for the boss kit.
GIN51E: you are right... not all boss kits fit all wheels... it depends on the stud pattern...
if you are after EASY... try to get an Autotechnica Boss kit as they are pretty much universal and MOST wheels will fit them.