69/70 Shelby Roll Bar

Does anyone have the dimensions of the 69/70 Shelby Roll bar? I would like to make one based on the factory dimensions, but I want it to actually weld/bolt to the floor. I already bought the Shelby boots that cover the bar where it enters the inner 1/4 panel, which is what I liked about it in the first place. I would like for it to retain the factory pick up points for the original set belts at the roof line, as well as the retractors.

Thanks in advance!