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You can mount any swingarm you want but it'll involve modifications obviously because you're going with a wider swingarm. Doesnt matter if you use the one from the rocker or any custom one.
The only thing I could find out about is that the inner primary is differnt it a 1/4" out further than a wide tire softail. I would also think that the trans mount is over the same distance or maybe not. I had a line on a used swingarm off a Rocker and could'nt find out any real answers. I have since passed it up. I think next winter I may try it or just give up on it and get a Heartland 250 kit.