Window balance

A quick learner from Chicago says:
September 19, 2016
I am looking at the S-600-39. The window balance I am replacing is white. The only options available are red and black. The window slash is 41 x 40 aluminum.
Please inform me if there is any other information that would help

Thank you in advance for your assistance
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Tom from SWISCO responded:
September 20, 2016
Hello! Most White Tip balances are actually an older type. The Red or Black tip may still work for you, but it would depend on the weight of your sash. I recommend weighing yours on a scale and referring to the chart on our S600-39 store page to determine if either will work.
39" Series 600 Spiral Tilt Window Balance
39" Series 600 Spiral Tilt Window Balance
S600-39
$10.80
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