Looks similar to the Givi locking mechanism (Zuk is made by Kappa which is a subsidiary of Givi). You MAY be able to get a Givi adapter plate (you will have to screw into the rack to mount) and mount your box to that. Do a search for happy trails and Givi. May also want to try to find a Kappa mount. Cant guarantee that it will work, but it looks just like the Give mount.
Red 2006 V-Strom 650: "the most shockingly competent machine in the world today"
Alpenkönig (a.k.a. King of the Alps): 2005, 2006
1989 Sportster Bobber Hardtail
1990 Electra Glide with Cop Bags