SERIES 306 SPIRAL BALANCE with a 2-1/2" extended spiral

A quick learner from Austin, Texas says:
I need to change my 3/8" spiral balances for an aluminum non-tilt window. 17" SERIES 306 SPIRAL BALANCE Product Code: S306-17. This window requires that the spiral extends an additional 2 1/2" past the barrel when fully retracted. Do you have this type of sash balance?

Thanks, John
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Tom from SWISCO responded:

Thanks for contacting us, John! We should be able to make this for you. Before we recommend anything, can you just tell me the weight of yours ash and how many of these you need? Can you also confirm the kind of clip you have at the end of the spiral? Many similar balances in Texas use the 15-142. I want to make sure you don't have this instead.

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