Well, that's one way, but I would add a large, reasonably thick, steel plate between the brace and the seat back. I think mine is 3/16" thick and about eight inches wide by 12 inches tall. It is cut into a hourglass shape to clear the harness holes, and bent to match the contour of the seat.
I just wasn't comfortable with a rod pointed at my spine.
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Ty Till
#16 ITS
Rocky Mountain Division