32 mm (1-1/4 inch) sounds right from what I remember of my old bar. I don’t know that all turboed Regals got the same bar though; and there may have been a smaller one. I’ll try to look in my Hollander Interchange tonight. The 32 mm Buick bar was SOLID; and the 34 and 36 mm bars (all of them?) are HOLLOW. They are obviously lighter; and said to be more rigid than the old bars. The 34 and 36 mm bars are said in several places to be equivalent in application. There is also what the ThirdGen Camaro & Firebird folks call a “Wonderbar” that fits between the frame mounts for these bars. I haven’t seen too many of those. Maybe they get lost when the Sway Bars get pulled. The Wonderbar would probably aggravate any intercooler instillation also. If you could make the Wonderbar fit; it would be a good way to help tie the frame horns together.
That’s all I know about it.
Thanks,
Joe