What spiral window sash spring should I order?

A quick learner from Tennille, Ga. says:
November 21, 2011
Springs made in 1960. 29 inch 5/8 tube, sash weighs 15 lbs. The lower brackets are your type X54. What color spring should I order? Thanks.
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Paul from SWISCO responded:
November 22, 2011
Please take a look at our S500-29 Spiral Balance with a red tip.
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