Stroked85-
Sounds about right, depends on what track you're at.

Taken directly from the rules found in "True Street" from Pro's website-

CLASS & SAFETY REQUIREMENTS
It is the participant's responsibility to familiarize oneself with the class requirements as found in the 2003 PRO rulebook and the safety requirements as found in the 2003 NHRA rulebook.
The participant agrees that the participant bears the ultimate responsibility at all times to ensure the safety of participant's vehicle and to ensure that participant complies with all applicable NHRA & PRO rules. The participant agrees that participant is in the best position to know about the construction and operation of participant's vehicle, equipment, and clothing, and whether there has been compliance with all applicable NHRA & PRO rules.

That is all they say, in the most vague fashion, about roll cages, saftey gear, etc...

I found that when we were seriously looking into running in some Pro events, and trying to find a class to fit into, their message board was very helpful. The tech officials were very responsive to any questions I had concerning my interpretation of the rules.