Interchangeability Code No.HMC/KMC CODEINTERCHANGEABLITY No. HMC/KMCCODE INTERCHANGEABLITY 1Y New and Old Parts are interchangeable 2A New Parts is usable on old car, old not on new car 1A New and Old Parts are interchangeable 2B New Parts is usable on old car, old not on new car 3C New and Old Parts are not interchangeable 4D Quality Problems, Use only New Part HMC/ KMC Y New and Old Parts are Interchangeable M New Parts is usable on old car, old not on new car N New and Old Parts are not interchangeable HMC KMC OLDNEW OLD ITC D in KMC is replaced with ITC M and AD of supply unit code in addtion, for the sake of differentiating from normal ITC, M. HOW TO READ THE PARTS CATALOG