Rear shoulder belt anchor point

[californiabristol]

Thanks to all for your advice and help.

Kevin, it is interesting to see that the factory placement for the rear(?) shoulder belt re-tractors are mounted on the longitudinal, rectangular-sectioned member out board of the fuel tank. This looks reinforced on your car. Your pictures are already very helpful. I have included some additional photos to show the current seat belt mountings on my car.
I am certain the rears are not original, and I believe I have receipts for their fitting. BCL would be the best source for advice. It won't hurt to ask.

Does the B-post mounting for the front shoulder belt guide look suspect to anyone?

Paul , I agree that the rear mounting is probably not safe, and the easiest solution would be to revert to simple lap belts as on John's Series 6
since the mounting points are already there. John, I am certain that the lower mounting points are original, but it would be good to get some
reliable, as-new images of the original seat belts for the forum(s). Pictures of your beautiful car would be nice in any case!

Paul D. good luck with your new seat belts from BCL. Please let me know how the new belts are mounted.

Thanks again,

Greg