Hey nickyb!
Yea, that is my goal, a 26.5" diameter spare, but would still like to stay with a compact "T" series. Doesn't look like I'm going to get an answer on the wheel Blown88GT was showing in the photo and I've looked everywhere I could think of, so I might be out of luck. I really don't know for sure if that diameter will fit in the wheel well either. I do know I really didn't like having to swap wheels around last time I had a rear flat.
I get some photos when the weather improves.