A quick learner from Southwick, MA says:
March 19, 2016
I am not sure what type of windows these are but they were installed in 1989. I am replacing the glass in three windows and will need to install new glazing beads.
Paul from SWISCO responded:
March 22, 2016
We may be able to help identify this glazing bead, but I cannot tell what it is based on this picture. Can you show me a clear picture of the end? That is the only way we will be able to find a good match. In the meantime, browse through our snap in glazing section, perhaps you could find a match here.