Working on the front end of my FXDC to run a Switchback wheel. The gap between the forks is 7 inches and the hub is 6 9/16. Any chance this will fit with a little reworking of the spacers? Or do I need to go "wideglide"? If so, will I have to add spacers to the brake caliper or rotor?

 

I'm interested to see how this looks...

 

There are really only two wheel hubs used by Harleys. Wide and narrow. Narrow and mid-glides (your FXDC) use the narrow hub. The switchback uses the wide hub. Spacers would probably be easy, brake rotors and calipers maybe, maybe not. Good luck...........