mahle and perfect circle is same company. At one time the mahle branded ring didn't come with a Napier second design. It does now on all the new mahle 1mm rings, so.its possible it does for these larger rings. If it does, buy the cheaper set since they should be the same in a different box4.030” with the speed pro H132cp pistons. Looking at the PC 315 0036 .035 or Mahle 4035 ms.