Dave Sr. from SWISCO responded:
March 14, 2018
Thanks for contacting us. I'm not sure how thick the glass in your window is. The new windows would be the thicker, but yours is kind of in limbo where it could have the older 3/8" or the thicker 5/8". Take a look around the edge of the insulated glass. The 3/8" glass would have a "glass seal" around the edges. The 5/8" would most likely have a metal spacer bar around the edge. Looking at your glazing bead I do believe it could be the 55-303 for the 3/8" glass, but without knowing how thick the glass is I cannot confirm.
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