I used half of each to get the oil clearances I was after, so half of each are for sale. New never run, only some light marks on the standard halves from measuring (no marks on the X halves). If you know you need this setup, it saves you from buying 2 sets! Part numbers - CR4125XPG STD CR4125XPG STDX (.001 extra clearance) $45 for the mixed set.