And if your looking on tire rack or discount tire's website, you should bypass the area where you put in your vehicle info, that is what will limit you to the tire size. You can just choose tires by description or size.

 

Further to the discussion, if you have a manual you've most likely got 3.21's, but if you have an auto they're likely 3.73's. I'm running 33's with 3.73's, and though the performance took a hit it isn't horrible. I'm hoping to get a programmer soon, to fix the shift points and the speedo. I'm running about 66 when the speedo reads 60. Check out - http://www.miata.net/garage/tirecalc.html - good info on speedo reading when upsizing.

But, there are a lot of people on here running 33's or larger with 3.21 or 3.73. And though the performance isn't ideal, we're are driving jeeps.