20 Riot, 21 Riot.
I am using the lower front arm mounting holes and the upper rear. I noticed when I had the track off and skid mounted in tunnel in factory mounting holes that the front of the skid/rails are off the ground. Like the limiter strap is sucked up a couple holes on a 137 or 141. No wonder everyone complains that the riot/146 doesn’t transfer weight worth a shit. With the front arm mounted in lower holes, the skid sits flat.