Just bought an adjustable type rear conversion kit from Norvil. Problem is that the long stud is a "really loose fit" inside the inner tube of the isolastic assembly. I emailed Les about it and received an immediate reply. Turns out he has them made that way on purpose; as it allows the mount to self-center when everything is all tightened up. This then compensates for the original frame build tolerances not being that exact. Makes sense to me Also, one of the collars had the hole not drilled quite big enough, and he sent a replacement Les and Norvil have been great to deal with, and I highly recommend the kit !