need to replace sash balance in a NuAir double glazed window

A home owner from USA says:

I need to replace two sash balance in a NuAir double glazed window. I have attached photos of the sash balances. The track they fit into is slightly more than 1 inch wide. Can you recommend the correct replacement?

Pete M
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Hey, Pete. Please see our S385-30 channel balance, this looks to be a good match. I'd also recommend the 2950 option.
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