What Color Spiral Balance Should I Get?

A quick learner from naples maine says:
the window size is 36"w x 27"ht Thats the bottom of the double hung metal part is 28" and is 3/8 thick any help would be great
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Bob from SWISCO responded:

Thanks for posting. Based on your measurements and pictures, it looks like you need an S900-28 with a Red Tip option. Let us know if you have any other questions.

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