Yes you can use Cat 153" rails no problem. Your going to want to use 153" rails from a 2014 M8000 though. I used 2013 rails and they are longer then the 2014 part.
When you do a 153" conversion, you'll want to mount the skid in the lower hole in the front and middle hole in the back. This is the Proclimb suspension mounting points and allows more clearance for the taller track.
I was able to make the 2013 rails work, however the track tension adjusters are backed off almost all the way and she was a challenge to install in the lower holes!
Other parts required are the tunnel extension, longer rear bumper, also on the 153 there is an additional alumium cross shaft between the rails back by the rear axle wheels as well.
For part # look up I used these guys
http://www.gearhead.com/snowmobile/part ... snowmobile
and they had all of the 2014 models listed
Edit: To get a Black tunnel extension in a 153", you may have to get a bare aluminum one and paint it. All of the 2014 proclimbs are bare, White, Orange or Green. They made Black ones back in 2012, but if I remember correctly the 2012s had cut-outs in the top of the tunnel and used rear heat exchangers to cover the holes.
Bill