I have three of these for sale. $50 each, shipping included.
You get both the bracket, and new adapters and big thick zipties that attach the adapter to your saddle bag so that it fits the quick-release bracket. These work great, if you have a saddle bag that you want to easily switch among bikes, or if you have a saddle bag that you remove when you reach your destination.
Here's a pretty good product description:
https://www.perennialcycle.com/bagman-quick-release-clamp.html
Please note: these are not Bagman Expeditions. That is, there is no metal support piece that your saddle bag rests on. I think these are most useful if you have a rear rack that your saddle bag can rest on.
Here are photos: