The Mendoza is probably too tall for your application. The Williams is great as long as your bolt is on the RH side. Not sure about fit on the 1322 or which one has the narrower notch (LPA or Williams). I've got 'em both but they're at home (and I'm at work right now). I'm inclined to say that the Williams notch is the narrower one, but I don't think there's much difference.
