3/8 inch spiral balance

A quick learner from Houston says:
I need to replace several spiral balances. They are 3/8" aluminum tube, with a red or orange bearing. They hook at the bottom is pictured in th attached photo. The rod is 29" long and the spiral seems to extended 2-1/2" out. In other word when I push it all the way in it still sticks out 2-1/2 inch ends.

What would I need to replace these. The windows are non tilt.
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Tom from SWISCO responded:

Hello! We can definitely supply this balance, though it will have to be a custom order due to its configuration. We'll be using our S300-29 as the base, but we'll be swapping the bottom shoe out for our 15-073. Does that look good to you?

If so, can you just tell me how many you need? once I know that, I'll email you an order link and price quote for that quantity.

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