Spec E46 Roll Cage Kit | Advanced Auto Fabrication
Amazon.com: Large Roll Cage Chassis Bar Steel Weld Gusset Plates, 5 Pk : Automotive
Speedway Motors Roll Cage Chassis Bar Steel Weld Gusset Plates with Holes, Includes 25 Medium .105” Thick 1-3/4” x 1-3/4” Gussets and 5 Large .125” Thick 3” x 4” Gussets