I've installed three plates to the stock Suzuki luggage rack, drilling so the fasteners come thru the decorative openings, so as not to damage the rack.
The top plate is the mounting surface of my new rack.
The spacers allow space for the rack fasteners as well as ropes, bungees, straps, etc.
The middle plate compensates for the stock rack openings/material voids. The plate has gasket material laminated to it so as not to damage the stock rack chrome.
The bottom plate acts as a large washer. Again, compensating for the rack voids.
I carry Motion Pro Bead Pro combination bead breaker/tire irons that are 16" long, so I bolt them in the rack space. The rubber washer give a snug fit and no rattling.
Twisted Throttle soft luggage rack installs with three one-quarter turn cam lock screws-sweet.
Twisted Throttle fuel canister racks install with no mods to the rack. One is for alcohol for my camp stove and the other for my adult beverage of choice. (camera angle makes canisters appear to stick-out beyond the saddlebags-they don't)
1 gallon Roto Pax fuel cell with its locking post. Post bolts come up thru the bottom of the new rack.
And finally, a Saddlemen tail bag installed-nice and clean! Hope it gives you some ideas to use.