Thread: convertible question ?

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It might be easier to just build a funny cage or side steer street roadster cage into the car. With a funny/roadster cage, you won't have to fool with the rear supports. If center steer, use a SFI 10.3 altered plan. If side steer, use SFI 10.4 street roadster plan. The dimensions and tubing required are in the rulebook or you can get specific plans from SFI.....
http://www.sfifoundation.com/drag.html

You can also modify a wider made-to-fit product by cutting the main hoop and the crossbar, narrowing them and inserting a slip tube inside that will be at least 4" into each side of the hoop and crossbar. Drill two 1/2" holes in each side of the hoop and crossbar and weld the bar to the sleeve tube inside (rosette). Summit has several kits that you could make work this way, but I still think a altered/funny/roadster cage would be the simplest. And the safest.