Largest size spare that will still fit below bed?

Hey--Does anyone know whether a 265/70R17 or 275/70R17 spare tire (probably either Firestone AT or General Grabber on OEM rims) will still fit under the truck bed? Getting ready to lift my 09 dbl cab LB and upgrade the tires, but want to still be able to keep the new full-size spare in the same location...

 

sean do you have any pics of your setup

 

Thanks Sean--so either tire size I'm considering should fit with a bit of modification.

No problem with your spare being to close to the exhaust pipe?

Thanks again--I was checking out your build the last week as I was deciding which route to go on mine! - MBros