Modern Seat Belts?
Here's a short write-up on a 3 pt. install I did a while back.
http://www.forabodiesonly.com/mopar/showthread.php?t=48125&highlight=seat+belts
The only piece of info that isn't clear is that I mounted the reel bolt through the bracket and into the rocker. The lower reel is mounted in 2 locations, the stock location, and an additional mount out back.
To date the belts are super comfortable and retract easily. And they look great in my bench seat car. Probably look just as good w/buckets.