Already had a quick Google and got no results. Does anywhere sell a harness bar for the 126 or is it one of those special made items you've to get built yourself?
If you're putting buckets in you may aswell get a full cage made, can't cost too much

If you aren't using buckets just mount them on the existing rear seat belt mounts, and try and run headrests to keep the belts from sliding down

My dad's been running his belts like this on his Escort for 5/6 years with no problems
