I got a wild hair up my ass and retrofit the Reflex pistons into the shocks of my S411 (Serpent). The pistons themselves were too thick to allow the c-clip on the shaft, so I sanded them down. The piston fits perfectly inside the shock body and is incredibly smooth (much "tighter" fit).... The only problem is the thickness
but it has worked great. I'm enjoying the Reflex springs over the Serpent ones, too.... the taller Reflex spring seems much easier to drive on our low/med bite carpet track.
I highly recommend the spring set for ANY 1/10 TC. I have used them on Associated, XRAY, and Serpent with great results!