I found (barely legible and might be off a bit) this stamped on the alum. window frame: SEP 1990 2MG 5ALI CBA
My replacement glass window contractor does not have this glazing bead in stock, and I suspect doesn't know where to procure it. They have glazing bead, but if the "lip" is not far enough down (the full 4mm) that inside edge, the snapping-in thing does not happen.
