I could SWEAR I remember Dave playing these two back-to-back before, around 01 or 02. Uhh, Mark? Could you....
No record of it, which means definitively not in the past 24 months, possible if 'twere in a set Darryl didn't catch between 12/01 & 4/04, and no idea before then. Maybe in an older set that you archived?
For the record, twice before Mott was number 1 & twice before T. Rex was number two, but not in the same sets.
ETA: Damn you got a good memory! I later realized that you weren't specifically asking about them being the #1 & 2 songs, just back-to-back. And I found it. Jan 30, 2003, they came back-to-back in the 4-5 slots.