Don't know if this will help. I tied into the deck lid hinge.
This is the rest of it:
http://www.rc-tech.net/pantera1/rollbar/roll.htm
Mine is in the interior shop right now. Should get it out at the beginning of March.
My plan for the rear window is to make a steel plate the same shape as the window with the cut outs for the roll bar. The steel plate will have the window opening.
The plate will go into the rubber and the window will bolt to the plate. the plate will have nuts welded on the back. This will allow easy window removal.
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