I'm working this one out myself right now for my Dyna Street Bob. I have the HD quick release mounts and the quick release sideplates and sissy bar. Now I believe I will need to get a wider set of quick release mounts that will accept both together. And of course I need a set of the quick release bags. This way I can use sissy bar with or without bags and bags with or without sissy bar. Otherwise you could just hard mount the bags to quick release sideplates and everything comes off and goes on together. Sound right?