I added painers to my TB over the weekend. I picked up a set of Saddleman "Cruis n Slant" saddlebags in the large size for $100 from Oneida Suzuki. (They have online ordering)
I simply took a couple of pieces of 1 X 1/8" Aluminum bar stock (Lowes or Home Depot) and four rubber insulated clamps (Lowes or HD). Using a couple pairs of pliers I bent the aluminum strap so it ended up flat to the back side of the painer.
One clamp mounted to the turn signal and the other to the foot peg mount
I removed the seat and simply adjusted the straps that comes with the bags so the two painers hung properly. I drilleed a hole through the strap and into the back of the saddle bag. I used a 1/4 x 20 bolt with a wind nut to hold them tight and stop them from flopping around.
Put the seat back on and your good to go