Does anyone have any experience with fitting three-point belts in the rear? I have a '74 CS that has no belts in the rear. My parts source (La Jolla Independent) suggested that the best bet might be a pair of new center lap belts from a 5 series. I looked at the anchor for the front belt (a inertial tension unit) and though I might just be able to put a second pair next to the first. That is, add a plate for strenght and put the two tensioners next to each other.
Does anyone have any sources for replacement belts - front 3 point and/or rear lap belts?