You can't see the rear one too well, but the three bags all held together and could be taken out as a unit in 5 minutes or....separated. Made some carboard patterns, flew all the way east to my friend the cobbler and then we started cutting/sewing. Designed some simple SS brackets, couple holes in the subframe side plate, never failed/galled or cause corrosion problems.
Brackets....because someone asked before, they looked like that,quick plan and scribbles off the top of my head because the bike was sold....no pics.
Note that I have the BMW mounts on there, also had another set of even older leather bags, I'd mount those to travel for weeks, then remove them and the OEM brackets and use the upper bags only for day to day use. 5 bags on the road.....more than enough.
Thinking of doing something like that for my K, that may be difficult re: the seat/luggage plate angles but not impossible.