I think you have me right in saying that roll cage riles are confusing. Also I need to say that no one roll cage rule applies across the board. A cage that is legal for SCCA Production classes may not be legal for Improved Touring, or Showroom stock, or Touring classes in road racing.

Autopower cages are desigend with SCCA classes and legality in mind. If it is SCCA legal it is always legal for NASA events for example. So the Autopower path is one you can count on being legal.

You can get the rule books from Greg Smith at an SCCA ODR autocross at Pungo. Call him before hand and ask him if somone has last years rulebooks and will let you borrow them. The cage rules haven't changed for this year.

The important thing to find out is the race weight for an improved touring car and production class car of your car..... (did that make sense) and read the appendix on roll cages and find out what size tubing is necessary (wall thickness and bar O.D.) Make sure the Cusco bar meets these. If it does then I would buy it. If it doesn't I would probably look at other options.