Here's what I've done to try and come close to the AC 43 recommendations on shoulder harnesses. I don't like the individual shoulder loops on the bar and folks have reported one shoulder slipping out on asymmetrical decelerations.
Not particularly elegant but satisfies the "webbing guide positions dual shoulder belts in the middle of the occupants shoulders".
Ralph
Not particularly elegant but satisfies the "webbing guide positions dual shoulder belts in the middle of the occupants shoulders".
Ralph