Gapco glazing bead?
A home owner from Lombard IL says:
November 20, 2014
I also have Gapco windows and the glazing bead is "V" shape with a small ridge on one of the outside sides. Do you have anything like that? Pictures include to assist.
Paul from SWISCO responded:
November 21, 2014
Our 55-161 has been popular with Gapco windows. Could that be what you have? I can't really tell, since I can only see the side of your glazing. How do the specs for this part match yours?