I got a little cheap. McMaster sells a u channel, McMaster-Carr, that fits perfectly inside the front runner quick release mounts. I got a 1/2 bar and cut off 2 2" sections with a band saw then drill 3 holes in the back to mount to the gfc t slots and the drill the top and bottom to match the front runner mount. Seems to be pretty sturdy and only costs like $20-25 if you have the mounts already.
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