Tom from SWISCO responded:
September 20, 2017
The correct Series for a tilt window with 3/8" balance tubes is Series 900. The correct item for your length is S900-35. As for the tip color, you're going to need to remove the sash and weigh it to tell. There's a chart on the S900-35 webpage that will tell you how to match the sash weight to a tip color.
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