Just a little clarification:
The 3rd leg to the normal type bar, or the rearward down bar is the only one that calls for the 1/4x20 bolt. This attaches the down bar to the hoop.
The main tube bolts all the way up through the rear crossmemer, (behind the seats) using 7/16's or 1/2" bolts!
A nice set up actually. Just another..for what it's worth Dept.
DV