Has anyone with an '88 Spider swapped out the !#@@#$%$ automatic seat belts for modern 3-point belts? My car has well-anchored bolts in the rear center to which I can attach the lap belt, but how do I keep the shoulder harness and harness-holder in the current position? I really don't want to swap harness sides and mounting hardware (like the newer Spiders have). The seats are not swappable so I'd have to re-do a bunch of upholstery to move the harnesses around. Plus there's all that electrical stuff under the rear section... I have seen some of the after-market belts available, but they don't look like they can be adapted to my needs. Suggestions welcome!