any idea what size spacer i need, may be going with a 6/8 pot ksport set.

 

I'm not sure about KSport, but the Alliance 8/6 fits without any spacers on the OEM 18's. Just depends on how wide the KSport brakes are.

Here are some pics of the Alliance if you want to compare them to the dimensions of the KSport.

8 pot:





6 pot:

 

thanks for the pics man! ksport, alliance, D2, PB-B are all the same brakes, just with different names