If I knew, I would happily share it with you but I don't know because I decided a while back that the 2020 (onwards) Rocket3 isn't a bike I want to use panniers on.
The bike is wide enough for my liking already.
Instead, I chose to focus more on fixing my load directly behind me. That decision was made much easier because I don't intend to tour on this bike with a pillion.
The pillion seat has gone and it has been replaced with a mounting rack. That rack can in turn, accommodate various luggage options. A hard-shell 'top box' or a large or small soft bag or waterproof roll top tube bag.......even a pillion pad when the need arises.
Added to that, can be the use of a tank bag, if I need more storage capability.
Keep posting your questions. I'm sure folks would know the answers will chime in with the answers you are looking for eventually.
Some links for you to have a read through.....
Multi-motorcycle swappable tail/swingarm bag?
Outfitting for Maiden Voyage - InterState Rocket | R3Owners
Soft luggage | R3Owners
