I have several factory-equipped 4-piston caliper cars and some spare sets. However, each car with this setup is tucked away for the winter and inaccessible to me. There are several threads on the topic. Check this post
http://forums.maxperformanceinc.com/...31&postcount=5
Entire thread here
http://forums.maxperformanceinc.com/...els+disc+brake
I hope that helps!