Military housing balances

A contractor from USA says:
I work on military housing throughout the country. I'm having trouble replacing these coil balances.
The springs are stamped with 3,4,5 or 6.
Any ideas?
User submitted a photo of a window balance.
Profile picture of Donna
Donna from SWISCO responded:
Thank you for your patience in this matter! This one took some tracking down, but I think we finally found a winner. We will be adding a new part to our catalog that we believe can replace this. Please give us a little time to have it made up, and I'll let you know as soon as it's available!
Profile picture of Tom
Tom from SWISCO responded:
Alright, please see our new Series 145 coil spring, in addition to our 15-102 and 15-103! I think you'll find this hardware matches quite well. We are still working on the sash guides and hope to have them available soon!
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