I tend to like corbett_auto's option #2.
Originally Posted by corbett_auto
Option #2 would be to reinforce the floor behind the seat and attach them directly to the floor centered on each seat.
This will never be a track car. I'm just looking to increase highway safety with more restraints.
Would it be okay to attach to the floor? I've always been under the impression that harnesses should always be attached around shoulder height.