I'm still working on the rancher 350. I have had the cylinder rebored 1 size over and purchased a Numura piston and rings. My question: Is the placement of the two top rings important? The reason I ask is 1 is slightly wider (not thicker) than the other. They both say 25 on them but 1 says N and the other NR. I called Numura and the service guy seemed like he never had been asked this question before and said well put the wider one in the deeper slot. I have measured both slots for width and depth and there is no difference. Could it be I just got 2 rings from 2 different runs?