Awesome.. yea I've got to do some measuring first to determine the size I'm going to go with. It will require a modified rear fender seat and fender mounting brackets on the side and the swing arm so I figured just go a the with it. Thanks for the info.Lots of members here installed 108ci and 110ci just use the advanced search feature. For any width swing arm get ahold of KyleNV but first identify your rear tire and get actual physical overall width and height and weight from manufacturer so you can focus on tire and rim and etc when talking with him.
You will also need a longer pulley shaft probably with extended bearing supports to match.
If you can afford it Kyle can cut and raise the top two frame rails and additionally brace the bottom cradle members (same challenges as the dual motor Bonneville Warrior). That would give you room for a 120ci or even an S&S 124ci. There may also need to be an exhaust pipe route modification at the front jug to avoid the front frame upright (Warrior configuration).
All you need is serious cash. There are already members here who have done remarkable things.