I just received some LEO marked 15 rd mags from Walther USA. I called saying that my mag baseplates were cracked and that I neaded 2 new floorplates, they sent me two new mags since they didn't have baseplates. Thanks, but I still have 2 mags that have cracked baseplates. But I won't look a gift horse in the mouth.
I am quite aure that If you call Customer Service for Walther America, they could point you in the right direction. I just got my replacement mags yesterday (my original 2x10 rounders busted). Both of my new mags are LEO stamped 12 rounders. Not a bad trade up! 6 days turn around time.