I just wanted to post this in case it helps anyone else. After spending an afternoon looking at tire specs and talking with installers, I decided to go with the following for the rear of my 2005 Limited (note that run flats cost about $100 more per tire & there’s a 45K mile warranty, which is halved if you run a mixed setup). I really appreciate the help! Now, to find an installer for my convertible top.

PILOT® SPORT A/S 3+