Don't ya just hate it when someone says "Weld it and file on it till it fits". This is a more detailed answer. It was done with a flux core MIG. It works but looks shit.
Mag needs the refinish and spit and polish that I am known to produce.
The above photo show the weld on the front tang about .060 is added to center magazine. Unmodded galil left, modded mag center, factory Yugo
The above photos show weld added above the rear tang (this is to remove front to back slop) and below the rear tang (.015 or less for a tight lock up).
The above shows material removed from the left lip for the "EJECTOR" as also seen on the factory mag. Hope this explains the Yugo/Galil Mag Mod in detail.
It works for me. YMMV