Yes
You can fit the FX filter to your FR or FS it is quite easy .
If you want to mount it on the blower housing then you will also need the metal FX blower housing
I mount the filter on the ROPS usually and just use a longer hose as the filter makes removing the blower housing for the annual fin clean a right royal PIA
Down here there is a genuine Kawasaki authorised conversion kit which does not void warranty locally .
Apparently they are not available in the USA
Fr/FS to FX kit
Take the "kaw" off the front of the part numbers & the rest is the actual kawasaki part number
Very much worth doing
I have done a lot of them
Sometimes you can luck in a 691 or 730 with a thrown rod cheap and pinch the parts .
There was a long thread about this some time ago hopefully some one with a better memory than me will remember the thread title .