What bushing to get for spiral balance

A home owner from Cushing, OK says:
I need to order 22 spiral balances for tilt windows. 3/8 x 32 in. I want to get the bushing for the stronger wt. Would the blue bushing be good. I cannot take out the window to weigh it. We have 11 windows that will not stay up and they are 13 yrs. old. Please help me. Nadyne
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Paul from SWISCO responded:
Hello Nadyne. Sounds like you need our S900-32 spiral balance, which does not use Blue Tips. What is the current weight of your sash?
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