Let's try this pic....
If you go back to my previous post you will see a pic that shows a black metal bracket that the bags mount to. That black metal bracket stays with the bike and the bags lock onto that bracket. The bracket mounts to the top rear shock mount and to a flange on the grab rail. If you don't use the grab rail they make a bracket that mounts to four tapped holes under the seat. You need either the grab rail or the custom underseat bracket to attache the side brackets the bags mount to. You also need additional metal brackets that stay on the bag. Once installed the bag bracket locks onto the metal bracket on the bike. The bags come in two sizes, mine are the jumbo size. On and off is 30 seconds per bag.
Dimensions:
Large = 15 1/2" L x 9 1/2" H x 5" D
Jumbo = 17 1/2" L x 10 1/2" H x 5" D