I believe the 2006 swingarm is the same as the one you already have.
harley got a bigger rear tire by using a wider fender and a narrower belt.
the parts from the '06 should bolt-on to your bike.
those are the hard parts you'll need.
you will also need a primary gasket kit and a quart of primary lube.
you will have to remove the swingarm,exhaust, starter, primary chaincase and primary drive to change the belt.