The set belt gizmo that the belt spools in usually mounts to a roll bar base mount bolt, and the top pivot usually mounts to the roll bar junction about behind the driver's head where the horizontal rear extention meets the main vertical bar. Clear as mud?
Sascha Steinway TLCA # 20217
1977 FJ40 "Ripper" (because it shreads!)
1988 FJ62 "Dino" OME, now in the hands of my daughter
2013 F-150 "Black Ops"