I bought some custom made bags from Aimee at
Leatherworks, Inc. She was the only person who was able to match the navy blue leather seats that Corbin had made for me. I cannot recommend her enough. She was able to offer all kinds of customisation and was thoroughly knowledgeable about the America/Speedmaster dimensions.
(Bigger pictures can be seen by clicking on the link in my signature)
They came with easy brackets. I really like the clean look of the bike when the bags are not attached. And it takes about 5 seconds to remove them!!