S765 Balancer

A contractor from Bethel Park PA says:
2 questions:

1. Does the S765 Balance look like the correct match for the unit shown in my picture? The top end looks different but its the closest match from the choice you have.

2. The markings on my unit is "1 21HD". Which option do you think this is equivalent to, 21-1?

Thanks
channel balance
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Tom from SWISCO responded:
I'm not sure the Series 765 is what you want. our Series 770 may be a little closer. Can you tell me the length of the metal channel? Can you also show me a clearer picture of the top and bottom ends of the balance, as well as a picture of the shoe the clip attaches to? Can you also tell me the weight of your sash? Thank you!
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