In the process of buying some parts for my H22A for a rebuild, on line though I only see parts for a H22A1 (USDM) and not for the H22A (JDM). My question is since the JDM H22A, the motor I have has a higher compression than the USDM motor. What exactly could I use form a USDM H22A1 without changing anything about my JDM. I believe I can use most parts from a USDM motor like the main and rod bearings, and all gaskets and seals etc. However, I think I can not use the rings and pistons from a H22A1 without altering the JDM 10.6.1 compression. Anyone know for sure exactly what is interchangeable from a USDM motor without affecting my JDM compression.