This is what I went off of. I looked at Nhra also they are a little different, side bars have two be added. If He is to go Pro we can add to it. Its no big deal. Thanks for that info.

2.1 ; Roll Bars
Roll Bars are required for all SCCA Sanctioned Professional Drifting events, these specifications apply to all vehicles unless specified differently in series specific rules.

The basic purpose of the roll bar is to protect the driver. It must be designed to withstand compression forces from the weight of the car coming down on the roll bar structure and to take fore/aft, and lateral, loads resulting from the car skidding along on its roll bar structure.

A. The Top of the roll bar must be a minimum of 2 inches over the drivers helmet when
the driver is sitting in a normal driving position (as near the roof as possible in closed
sedans) and shall not be more than six inches.

B. The two vertical members forming the sides of the hoop must extend the full width of
the cockpit to provide maximum bearing area.

C. A system of head restraint to prevent whiplash and prevent the driver’s head from striking the underside of the main hoop is required. The head restraint must be padded with a non-resilient material and must be capable of withstanding a force of 200 lbs. in a rearward direction. Closed cars with full cockpit-width main hoops must
have two (2) braces extending to the rear, and attaching to the frame, or chassis. Braces must be attached as near as possible to the top of the main hoop (not more
than 6” below the top), and at an included angle of at least 30-degrees. Main hoop rear bracing shall not extend rearward past the shock towers and must be of the
same dimensions as least equal to that of the main hoop. One diagonal from the top of the main hoop not more than 24” from the drivers side vertical down to the passengers side vertical. A Horizontal bar between the main hoop and diagonal no higher than shoulder high is required for shoulder harness mounting,