I found that on the bottom, both sides, the belt mounts are made with no obvious way to fit in the limited space. I think that I can make up some 90 degree adapter brackets to allow using the rear seat mount bolts to hold the latch belt assembly on the tunnel side (after bending the bracket straight, the hole position can't fit the space avail. with the 90 degree bend) On the outer side I can cut off the slight lip on the bracket and attach it to the seat belt bracket that allows the belt to slide as you move it across your lap.

as an alternative I could bolt them to the seat brackets but that wouldn't be very safe as they are only attached to the car through my sliders!

I also eventually plan on using the harness approach but I want to have the std. belts there in an as close to single donor build as possible.

It is amazing how much lower you get with the aftermarket seats!