Dave Sr. from SWISCO responded:
December 21, 2017
I don't believe that retainer strip is still available. It does look similar to our 55-208 vinyl glazing, but I'm not sure if it will do the job for you. You might be better off going to a hardware store in your area and purchasing some small aluminum angle and securing it with small sheet metal screws like the 33- 085. See what you think.
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