I have a 2" extension on my swingarm. Viking Motorcycles did it for to my measurements. The 2" extension is perfect, but you cannot use a 139T belt because it is too long. I have a 137T belt on mine and it looks longer than stock, but still looks factory made, not overly long. With the 139, the adjustment was over before I could get the proper belt tension, also, the tire was knocking against the rear fender when I sat on it. Granted I weigh 280lbs, but it may be a problem for lighter guys, too. I put the Baron's hvy dty spring on at the same time. The whole conversion actually makes the bike ride way better IMHO. You can see my bike in the for sale section of the classifieds forum, it is under Midnight Run's post 02 RSW with lots of custom work. Check out the front brakes, too!!!!