The harnesses bolt up very nicely. The tail strap has two mounting points. I bolted one the the rear seat belt latch, and the other to the bottom mounting point of the actual seatbelt. The front part of the belt bolts to the stock seat belt mounting points. All of this can be done without removing the stock seat belts and without removing the rear seat. When I'm not using them, I tuck the tail straps under the rear seat and hide the front section behind the seats. I hope this makes sense. if not, let me know and I'll take some pics and havve them up in a few days. Sean H '92 535i