the PC rail compared to the M rail (09-11) the mounting holes in the rail are 2.5" closer to the rail tips (front). If you tried to just bolt on PC rails onto a M you would have 2.5" more clearance from track drivers to rail tips and the extra 2.5" in the rear length makes the skid to long to even install it.
So in short to answer your question , it is the opposite the rail actually moves back. But the right way to look at this is with the arms on the skid being farther forward more of the engine weight is on the front arm ( shorter pivot point) more rider weight on the skid, the biggest part of rider location is the skid finally does not kick you in the back up and down the trail. The rear arm is under your but vs behind you.
I changed my board inserts to Monster boards and I had a lot of stuff apart already and I had been thinking of this mod for awhile so I got at it. I dont think this is that big of a job but I work on sleds a lot so this is probably not for everyone. BUT if you think that the M is just a few "mods" away from being a better mountain sled then it was when it was the best. 10-11 Then this along with the 36" arms will make anyone that rides it say wow this old thing works.
Who makes the 36" front end kit? or do you have to cut and shorten the arms yourself?
What track length did you do this mod on? I've got a 162 M8T ,09
I'm planning on a 2.6PC track, when I change that, I might just do this mod as well