Down stairs window

A home owner from Las Vegas, Nevada says:
1/2 in width
28 in length
Markings 27 2 BSI PD
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Bob from SWISCO responded:

See our S351-28 or S390-28. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. For a new stamp option, choose 2720.

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