New tires for 2016 Limited 4x4 - Will they Fit?

I'm looking to put a more aggressive tire on our 4Runner. It came from the factory with 245/60 20 tires on it. I'm having problems finding replacements that are exactly that size. I would like to put BFG KO2s on it, but they only come in 275/55 20. That's 1.2 inches wider. Does anyone know if that tire would fit without rubbing? I don't want to have to make any modifications.

 

We have a 5th gen 4Runner and it came with 265/70R17 stock. It is now fitted with K02's in 275/70R17 which are bigger than 275/55R20's. Use this to calculate size.