I know it's very late to reply but I still want to share my experience here,maybe it will be helpful to others.
What I have is 2012 kubota rtv 900 and one of front cv joint axle (Driver side)was worn out.
So I went to the kubota dealer, they told me the front cv joint axles of 2009-2014 RTV 900 4x4 are the same and wanted to charge me $200 for a new one.
I think it's very expensive so google cv axle replacement cost online when I got home.
What I found it's between $50-$70 for a new kubota rtv 900 cv axle replacement, for example,Hex Auto Parts has kubota rtv front axle for sale ,only $60 free shipping.
Much cheaper and save me a couple hundred dollars.
Finally I got my axle for my 2012 kubota rtv 900 and install by myself in two hours.
Now I am waiting for spring and really want to ride my rtv 900 when the weather warms up.