Unique balancer 19-D-40

A distributor from Kent, WA says:
I am looking for replacement balancers for a single hung door, Unique 15-D-40, and 19-D-40.
I have some other pictures to help identify the balancer needed for replacement.

Please help me find which one of the balancer can work on this window as replacement.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Sure, I think we can help. The balance manufacturer who made this went out of business, but we can still custom make it for you. I'm thinking our Series 770 channel balance but with a 62-105 hook specially attached to the cord. Does that look good to you? For your two different balances, I would make you a S770-16 with the 62-105 hook and 16C option, and our S770-20 with the 62-105 and 20D option for the 15-D-40 and 19-D-40 balances, respectively.

If that sounds good to you, please tell me how many of each you will need. I will send you two order forms and price quotes for each.
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