I installed the fixed position backrest and it went smoothly. The only continuing problem is reinstalling the backrest into the mount bracket through that slot in the seat. I could not imagine a more difficult design. Sometimes it slips right in and other times I screw with it for a half hour or so to get it locked into the bracket. Surely some engineer could figure out an easier design that this.
Everyone makes it sound like a big deal taking the ultra seat out, so I was kind of apprehensive. I used an offset screwdriver with Phillips 3 bit, screw came right out. I put a sock on the tab in back and just pulled seat out no problem. Went back in easy and securely. I am just going to keep my offset ratchet made by General on the bike, with a PH3 bit. And a sock. This may be a dumb question, but what's wrong with the stock backrest?