What size exhaust clamp should I use

[Mantree]

So after lots of complaining from my better half I am going from open headers back to a traditional exhaust. I have the stock 2 inch id exhaust o my 22re 4runner but trying to patch it back together I ran in to a stumbling block. The od on the pipe is 2 1/6 inch so I am not sure if I should use a 2 inch clamp or a 2 1/4 clamp to hold the new cat where I was forced to cut the old one out after it had failed.