29 2 BSI TJ- Need help to purchase this for my window.

Quick Learner from Naples
I need help. I need to purchase 4 of these. Can you recommend me what to purchase.
The only markings I found is: 29 2 BSI TJ
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Bob
Bob from SWISCO
SWISCO
Expert

Hello there. This looks like either an S380-30 or S385-30 Channel Balance. The only difference between these two balances is the 'depth' of the bottom nylon shoe, or the heel-to-toe measurement. See the diagram below for reference. Compare both with your old hardware to see what matches best. For a stamp option choose 2920.

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

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