I have some, at least 3, I had those 3 in my hand today. Made by Western Metal Products or something like that. Commercial just before the Brady Ban.
They don't work in my M1A for crap, but they should fill the pouches in Alice web gear just fine. If you pay the shipping they're yours. I'll check because I think there are at least a couple more. (I almost always buy magazines in 5s or 10s).