1/2 wide and 28 inches long

Quick Learner from Arizona
I need to get a windown balancer ro replace in my window. on the end it says 27  3  there are some letters that might be B.S.I
 
 
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Bob
Bob from SWISCO
SWISCO
Expert

Thanks for posting. See our S351-28 or S390-28 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 balances with your old hardware to see what matches best. For a stamp option, use 2730.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

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