Sorry about the subject as it doesn't probably make sense, but I dont know what else to put there. I got my head back from the shop minus the shims under the buckets I have no idea what sizes they were and no idea for a starting point to begin. Are the exhaust and intake shims interchangable or specific to each side? What size(s) would be a good starting point? I do not believe there was a 'standard' from the factory since each part varies, correct? Bike is a 2000 426 and I will be putting the 450 exh cam in. thanks.