Check out bb Reproductions:

http://www.bbreproductions.com/bags.htm

I have the Black Saddlebags featuring double speed comets & studs. They come to about $700 with brackets. They are hard 50s reproductions with plenty of room. They look like they were made to fit the BA. I can get chaps, riding jacket and a few other things in 1 side. It also holds a 12-pack of 12 oz beer cans in a soft sided cooler. They look great and get a lot of attention. The photos on their web site include a Speeedmaster.