The rack is the one that comes with the sissy bar with the back rest removed,using the universal mounting bracket supplied with the GIVI box. It just uses 4 bolts to mount onto the rack. I can still use the backrest for holidays when I use my my sissy bag as the bag just rests on the mounting plate, and its just four bolts to put the backrest back on.
I too missed my topbox as this was my 1st cruiser bike and I had always had a topbox or hard panniers before. I had reservations also and asked on this site for photos of others that had attached a box which made me go for it as in my usual day to day I like the peace of mind it brings.
