Help with which parts to order

Home Owner from California
I would like some assistance to identify which lift mechanisms to order for my aluminum window. The old lift mechanism is marked 26 9 34#. DL CALDWELL. Both the top and bottom channel clips have wings. The metal channel of the old lift mechanism measures 27 1/16 inches long. The front of the lift mechanism measures 1/2" in width, while the back of the lift mechanism measures 11/16" wide. The shoe measures 1 and 1/16" in depth. The overall length of the old lift mechanism (including plastic end clips) measures 28 and 1/8". The window sash weighs 31.6 pounds. Your help to identify which lift mechanisms to order is greatly appreciated. Thank you for your time.
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Tom
Tom from SWISCO
SWISCO
Expert

Based on your photos, you have either our S380-27 or S385-27. The only difference between them is the size of the bottom fitting, which is indicated on their respective store pages. You'll need to measure your bottom fitting to confirm which one is the better match.

Comparison of the S378, S380 and S385 balance shoes.
Comparison of the S378, S380 and S385 balance shoes.
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