last fall I tried the OEM 2010 KXF450 metal clutch plates in my 500...they wouldn't fit on my stock OEM hub. The part #'s are the same from '07 thru '14 for the 450...13089-1095, but they would not slide onto the hub, even with a little pressure.
I could've sworn Alex saying they worked on the K5 in another thread...unless I mis-understood him.
I just ended up going with the stock OEM K5 plates...and they slid right on as they were supposed to.