It's not just the dealer, the Ski-Doo guys at the booth for the Snowest UT how also said you can't run the quick clickers because the side panels on the XM are trimmed up and closer in to the clutches.
I've got them on my '13 and took it for a little ride today. No rubbing. Maybe I'm missing something, but they don't look like the even come close to the side panel.