Not Ranked
I assume you know this, but roll bar is not required for approval.
So it's up to you whether you make a single, 2 x singles or large single hoop etc.
Roll bar choice will also be affected by how much you plan to race the car.
To give you a good starting point, Don from Snake Bite uses 2" Stainless tube with wall thickness of 3mm. He supplies them both where rear stay finishes at the body or where rear stay continues through the body to mount on the chassis. So look at making something along those guidelines or at least that's a starting point. Or you could just buy one of his, they are a work of art and made specifically for each kit brand, including CR. We bought one of Don's Roll Bars for the Harrison my brother races.
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