Lets clairify....All harnesses should bolt to the floor. Simple enough statement, but not specific enough.
Your lap belts should not be bolted to the seat, and not even to any seat support or frame.
Your shoulder harness should NEVER be mounted to your seat or seat frame. It should also never have a mounting point below your shoulder blade.
This is the reason I am still using the stock shoulder harness. I do not have a mounting point for a off road (racing) harness near my shoulders...
Like I have mentioned before, I don't like the feel of high speed* runs in a Cherokee, and until I cage my junk I will keep the stock seat belt myself.
Rick
* I have been in Cherokees on high speed runs, and have determined that high speed in a subjective term. Hopp into one of my buggies
then I will show you a high speed run!