I connected both upper harness straps to the transition bar the stock belt is connected to. The bottom straps were easy, just wrapping underneath the bottom cockpit tube behind the seats and securing with a big bolt.
Very happy with having this done and how it was done. This is one of those things which has kept me up at night contemplating all the variables on how to do this right. The harness is very comfortable, it’s not confining, since it moves freely with the occupant unless it needs to lock, my roof is now more solidly built, and it really didn’t take up any luggage room, aside from the roof.
Bottom seatbelts wrapped and bolted to bottom cockpit support tubes
