Technically they are not really saddlebags as they are not pouches and do not hang over the rear wheel. They are hard panniers that only look like leather, hence the name, LeatherLyke.

Mounting involved removing the seats and rear fender rails, disconnecting and removing the rear turn signals. Mount the rear turn signals on the provided bracket, remove license plate and remount with the turn signal backet now attached tothe license plate bracket. Snake wires thru the center hole of the turn signal bracket, wraptie to tail light wires. Remove grommet, snake a thin wire alongside the taillight wires, attach to turn signal wires and pull back thru the same path as the tail light wires. Enlarge center hole of grommet and replace. Stretch tail light wires with provided wire/splices and reconnect. Test. Re-reconnect correctly (it's a 50-50 chance unless you label, and easier to reconnect than to label.)
The bags mount on pairs of studs. The rear studs mount to the fender rails in place of the turn signals. The front studs replace the upper of the two forward fender rail mounting bolts. Once the fender rails are back on replace the seat, lube the studs with the supplied lube and slip the bags on. Lock the bags on with the clips on their leather retention straps. The bags rest against the rear springs with a nylon rub strip. The bags are rated for 20 pounds each.
I can now carry my Hat while riding.

added 11-27, per Diane's suggestion:
The bags were purchased on line direct from the manufacturer,
Hoese for $429.95 (plus shipping.) Other places also carry the LeatherLykes, but all the one's I found asked the same price as Hoese.
The bags have made my Thumper into a very handy shopping cart. Yesterday I carried: left bag: 5 Liter box of Peter Vella White Zinfandel: right bag: two 8-oz tubs f Cool Whip, a 2 pound summer sausage, a box of Hearty Wheat crackers, 2 small jars of turkey gravy. (also the usual paperwork a couple of CDs, old reciepts, the basic automobile glovebox junk.)