O.K. here is a question I have that I could not find in the FAQ section. I purchased the Z31 5lug hubs from Modern-Motor Sports with +40 offset, using the 300ZX vented rotors, calipers are the Toyota S12W. My question is what is the thickness of the spacer that is needed to push the rotor back far enough from the hub so that it will mate up with the caliper. Tried contacting Ross at MMS but to no avail, no response.