Paul from SWISCO responded:
August 29, 2016
Hello! My first thought when I see the photos of your window was that they might be Acorn, but Acorn used odd length balances. Also, the white top tilt latch isn't original, so I can't be sure. What I can tell you is that you have the old style pivot shoe that has since been replaced with the 15-015. I would also recommend the 26-040 tilt bar. Carefully look our information over for these parts to confirm. For your window balances, I suggest the S600-22 blue tip for the 5/8" diameter balance, and our S900-22 blue tip for the 3/8".
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