no worries, you can swap bearings but I think you need to swap the swingarm, I know people swapped them out for 00+ Roadking Swingarms which upgraded the bearings.
What year FXR do you have? I have an old 85 FXRC
just remembered, a few companies did do upgrade kits.
https://www.fxrdivision.com/fxr/bare...ing-conversion