Mine isn't a Promark, mine is a Venom.. But I had a simliar problem on my '08 Prowler. If I were to mount it how the directions said, one of the power leads would be against the frame.
See this thread: prowlertalk.net/forums/arctic-cat-prowler-general-discussions/2507-mounting-winch-angle.html
I didn't use the Fairlead mount at all. I just used the model specific mount that came with the winch for extra strength and just ran the bolts through the front of the Prowler into the winch. I used longer bolts on the bottom where it went through the roller fairlead into the winch.
The winch manufacturer said it was OK for me to mount this winch at any angle. I'm not sure if they're all like that or not.