Here is the 991 GT3/RS Roll-bar option that we can offer.
This cage was designed of the 991 GT3 Cup design. We have now included a knot brace in the first cross like you would find it in a cup car for added strength.

Features
-1.625" x 0.095" 4130 chrome moly steel tubing utilized for excellent strength to weight ratio

-TIG welded and utilizes "X" braces on front and rear sections for superior strength and rigidity

-Mounts to longitudinal frame structure (utilizing factory bolts) and rear strut towers to provide strongest mounting points and maximum protection

-Utilizes laser cut mounting plates & inner diameter tube clamps that are CNC turned and milled for a precise fit

-Designed to work with stock seats or any aftermarket seats on the market

-Allows full seat travel to accommodate taller drivers

-Can be used with stock seat-belts or 6 point harnesses for track use

-Designed to work with wrap-around style harnesses while optional eyelet bolt provisions are available for clip-in harnesses

-OEM fit & finish. The main hoop contours entire arch of the roof with an even 3/16 inch gap

-Finished in satin black powder coat. All custom colors available as well

-Bolt-in installation requires no drilling and minimal carpet trimming

Cage can be powder coated in any color you wish.

Shipped within the continental US the cage costs $3700.00