You may be able to find some Prolines, you'll probably have to watch ebay though, they stopped making them. I believe CEN's MT uses 23mm hexes, I'm not sure what size wheels though. I believe Integy makes them as well, hopefully their plastic holds up better than their aluminum.
---------- Post added at 9:34 PM ---------- Previous post was at 9:30 PM ----------
If it wasn't so close to Christmas, I'd probably grab
these for my XXL.