A quick learner from 49417 says:
September 30, 2016
I believe this is off of an Atrium window, the 150 series single hung. I need enough for two windows, about 24 feet.
Dave from SWISCO responded:
October 3, 2016
Thanks for posting. I'm afraid we can't seem to locate this exact beading. However, see if you can use our 55-197 as a replacement. It's a "push down" type glazing bead, which I believe is what you have, as well. It has a rounded face were yours has a flat face, but I think it may still function the same way.