Replacement 17 2 BSI TG

Quick Learner from Sarasota
I need replacement for this window balance 
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Bob
Bob from SWISCO
SWISCO
Expert

Hello there. This looks like the S378-18, S380-18, or maybe the S385-18. The only difference between these channel balances is the 'depth' of the bottom nylon shoe. See below. For a stamp option choose 1720.

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

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