Thx for the help guys.
I've had 28" Mongrels on my Jagged X for about 400 miles now, and they're working quite well. VERY satisfied.. Like Bidedmond said, they very slightly rubbed the tab that holds the mudflap, but only on the passenger side on my unit.. I actually loosened all the screws that hold the fender on, slid the fender back and up as far as possible, then retightened.. No more rubbing. If clearance becomes an issue (with mud buildup or whatever) I'm going to do the fender mod illustrated in the link above, but so far, no need. We've also added the EMP mud flaps and love the extra coverage.!! The instructions were a little vague, but we figured it out, relocated a couple holes, added a couple push pins, and they work quite well. RZR XP900 Fender ExtensionsForward A Arms or fender mod required for sure with 30's. I have to do the mod on my 28" Mongrels as they were slightly touching the mud flap yesterday.