Pivot shoe ID

A quick learner from USA says:
Good morning,

Last week I spoke to a real nice lady who was very helpful identifying window balances and parts I need to repair five windows in my home.
I think the balances I need are are the series 775, 28B 1 1/4. The Pivot Lock Shoe looks like the picture above.

Can you please advise which balance and what shoe I should order.

Although I have at least six Windows, I want to order and try one set first to make certain I have it right.

Thank You Very Much,
User submitted a photo of a pivot shoe.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. The pivot shoe looks like our 15-129. See how well the dimensions match up. However, this is not used with the Series 775 channel balance, which comes with its own shoe. I don't think that's the balance you have. Assuming your balance channel is plain, our Series 770 might be a better match.
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