Guys this might sound dumb but here goes. I just received a set of SPI pistons for a 800 XCSP polaris and the rings are two different colors. One is silver/grey and the other is black. This would be on the flat portion that fits in the ring groove. The silver/grey one has a red dot on the edge where it would ride against the cylinder. Which one goes on top. I have used SPI before and never seen this.