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mine is a custom done by a local race shop. .130 wall seamless 1 3/4 mild steel which exceeds the SCCA or NHRA requirements.
With me it a personal safety item. I feel much better with it.
Norval - The front of the door bar which goes through the floor about mid calf. Required welding a 4X6 inch 3/8th plate to the bottom of the frame under the door with about 4X4 of it hanging inboard. So the cage pipe comes down on top of it on the inside of the frame rail
From just under the dash you put a pipe going forward nearly a straight shot that attaches to the frame rail just behind where the engine mount is.