Featured Touring Back Hame

They are Harley style bags with a softail bracket. I had to make up some adapters to fit the bike. They are not really quick release, though they have split pins on the inside that allow you to remove the bags.

The other choice is Craven Equipment
craven-equipment.co.uk
They do a bracket for the Speedmaster but I think they are more suited to the Bonneville, that 50's 60's look like on Heart to Heart.

The speedmaster is more like the '38 Speedtwin and so a more Art Deco style is more appropriate and to my taste.
Also had them on my Road King, I like them and you get a ton of accessories to fit them.

https://www.thetriumphforum.com/threads/2022-speedmaster-pannier-options.31080/