I ordered some retractable 3 point seatbelts for my truck! Pretty happy, they look like they'll be fairly easy to install. I think what i will do for the high point is drill a hole in the inner wall, tape the nut and two washers to a socket wrench, and extend it really long with a bar or something...then feed the bolt through the hole and try to line it up and thread it in. Think it'll work? I'll let you guys know how I do with this!