So it's finally time to put in a roll cage into my '83 ITA/IT7 RX-7! A good friend of mine is aircraft certified in welding, has done a few cages for different IHRA cars, and offered to weld one in for me. Does anyone have any suggestions for manufacturers of ready-to-weld cages? I need the pieces cut, sized, and bent for my car, and just regular steel, none of the fancy Cromoly stuff. I'm located in the Indianapolis area. Thanks in advance!

Required pic (when I picked it up):