@Deanoski The new SuperShell had the strap in the back. I pushed the cuff all the way forward to tighten the strap, then I drilled it in that location. You should start by drilling one side and trying it. If you want to set it more forward or back, just drill another location on the other side and try that instead. When you are standing in the boot, you will notice that your front leg can get all the movement it needs with the cuff bolted. This change will also help the release to work better, that was the idea of the strap. My back boot is the R-Style and it gives me plenty of knee bend. I highly recommend the SuperShell with the R-Style rear.