Hi Mark, the harness system I fabricated uses the stock seat belt mounts for the lap belt and a "Y" belt arrangement for the submarine strap and a bracket that I fabricated for the shoulder harnesses...The bracket is attached to the stock seat belt reel on the cross member of the frame behind the seat, then goes threw the seat using the HMS gromet....If you Emailme directly I'll send you some pics,rather than use band width here....Good luck and hope this helps, Tom : I have a '98 1.9...anyone who has installed 4 or 5-point harnesses in their Z3 please let me know what brand/type works best, and where you attached them...Thanks