Hi i have a vz 52/57 and had the same problem you are having,(finding mags),My solution (as long as you dont mind modifying your gun very slightly)was to use modified ak mags,you will have to do some milling to the mag opening for the ak mag to fit,VZ mags will still work fine.The mods to the AK mags are simple, allyou need to do is cut the locking lug off the back of the mag and reweld a new lug about 1/8" higher up,with a little filing and polishing you will now have a working AK mag for your gun.The only thing that doesn't work with the new mags is the bolt hold open.Pm me if you are interested and i could take some measurements and some digital pics.