Window balance

A quick learner from Chicago says:
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:
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.
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