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This guy knows what he's talking about. Hard Dog is just about the only option for a truly functional roll bar. Autopower makes a bar; not sure if it claims to be functional or not, but most racing clubs won't approve anything but Hard Dog or a custom, well-built cage.Get a Hard Dog roll bar.
http://twosrus.com/catalog/product_info.php?cPath=23_49&products_id=603