I just took mine off as well. I do not know the different sizes of the tubing, but I think mine is 1 7/8. It's from a 2007 Supra.
If Smitty75's does not fit, i will get a measurement for you.

Otherwise I will get mine posted on the board in another week or so. I have to take some pics. I'm going to try to sell all my stuff:
Kenwook Amp
Kenwood Speaker Cans & Light Bar Combo
Kenwood 6.5" Speakers (6)

Mark