Rear Spider seat belt anchorage points

[mangocrazy]

Due to the vagaries of the French MoT system, I need to fit rear seat belts to my Spider to get it through the test (see also parts wanted). However on further investigation, my Spider only has 3 anchorage points; two between the rear seats and on on the N/S inner wheel arch. There is no anchorage point on the O/S (i.e. driver's side) wheel arch. I can only assume mine was a Friday afternoon car...

How would one go about rectifying this? Get a suitable threaded insert and weld it in at the correct point? And what is the correct thread size and pitch for seat belt anchorages, anyway...?

[WestonE]

Graham

Look on the Demon Tweeks web site for Seat Belt/ Harness Stress plates. These can be welded in from the wheel arch side. The threads are all the same and something weird like 7/16 UNF from memory.

Eric   

[mangocrazy]

Cheers Eric, that sounds like a plan. I also remember the thread size being something oddball (and non-metric).