BMR Fabrication 1998-2002 Camaro and Firebird - Convertible Subframe Connectors Enjoy the same features as the above when using BMR's convertible subframe connectors. While GM attempted to reinforce the convertibles floorpan with formed sheetmetal, nothing increases chassis rigidity like a pair of subframe connectors. Constructed with 1-5/8" rollcage tubing and laser cut, 1/4" weld plates, these subframe connectors will change the "feel" of your convertible. Available in Black Hammertone or red powdercoat.