[Professor]

I am just starting to build my Cobra. I have a friend that will make a stainless steel roll bar for me but I need the specs. on it. Mainly how high does the bar stick up above the body? Is it basically 12" center to center? Are all roll bars 1.5" or 1.75". What about making it 2" or 2.25"? I realize it's my decision but I would like a second opinion. Thanks in advance for any replies.