I dont have a rulebook, and suggest you get one to make sure that you meet your specific needs.
I installed a rollcage in my car, but its for open-track events (loose rules).
http://216.59.112.100/~drudis/mustan...images/190.jpg
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Darius Rudis
Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page