Andersen sash balance

A home owner from Ct. says:

Which of your replacement parts matches this right side sash balance "BS5 1027 7-88" also marked 11600-17.

I will need the left as well.

This is from an Andersen narrow line double hung glass etched "CIG-2 3-88" from ~1989

Both rt and Lft have same markings

Thumbnail of the uploaded file named 1027
Thumbnail of the uploaded file named 1027
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Bob from SWISCO responded:

See our 24-1033. This is meant to replace Andersen balances with the stamp code 1027.

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