What tires can/should I buy for a 2720?

[Meteor]

Sorry if this has already been covered, but I can't seem to find the answer in the existing posts.

I have a 2008 2720 for which I need to buy new tires. I'm trying to decide whether or not to buy 14" tires as it currently has, or go ahead and move up to 15" tires now rather than later. But how do I know what tires will fit? Is there an easy way to know what size I can get, such as ST225 75R15 to replace the current ST215 75R14? And, is there an easy way to identify if the lift kit is already on my TM? I have read several posts that state that in 2008 the factory started adding the lift kit to all models.

Thanks in advance for your help!