OS-Rack loops can be bolted on the underside of the rack.
StandardKriega OS-rack loopscome with Kriega bespoke flat head bolt which can be replaced with M6 buttonhead bolt.OS-rack loops KTM fitcome with M6 bolt which can be used to bolt the rack loops on the underside of the rack.
When using the standard Kriega OS-Rack loops, it's advisable to add some thread locker before tightening the bolt. For KTM fit OS-Rack loops I like to add an M6 flat washer and M6 safety nut on the underside, as shown in photo below. This will prevent OS-Rack loops from coming undone and falling off when bag is not installed. Don't ask how I know...
Take a look at how all three Kriega US-Drypacks fit the Tuareg.