Pivot shoe identification

A quick learner from USA says:
I am replacing spiral balances on my tilt windows. I need the 900 series balances (3/8
User submitted photos of a pivot shoe.
Profile picture of Paul
Paul from SWISCO responded:
This pivot shoe resembles our 15-121, which measures 1-1/4" wide and 9/16" thick. Can you confirm?

You may also want to re-measure your spiral balances. The 15-121 doesn't work with 3/8" tube tilt balances. They use our 5/8" tube Series 600 tilt balances. Please double check.
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