spiral balance replacements

A quick learner from Buffalo, mn says:
I'm looking for replacement spiral balances for double hung windows that may be as old as 50 years. The tube is 9/16, I'm looking for lengths of 25 and 27 inches. The bottom attachment is 2 1/2 inches x 3/8 inch.
Thank you.
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Paul from SWISCO responded:

The balances look like they are our Series 500-25" and Series 500-27', both with red tips. 

The bottom bracket is no longer attached to the spiral, but hooks on to the bow tie of the spiral balances. You can use either #17-007 or #17-012

The charging tool, #75-005 is used to add tension to the balance. 

See our media guides for more help.

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