Givi stuff is good---doesn't fall apart or off. My E-46, 1998 model, used on 2 new Silverwings and other bikes/scooters. Currently has over 500,000 miles. Still service able! Dog likes it.
Remember too much weight above and to rear of rear axle center, maybe not best idea. Givi makes boxes bigger than 46. Check with Givi USA for box size.