A quick learner from Bradenton fl. says:
Pgt old aluminum windows
Length of balncer is 30 inches only metal part
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Bob from SWISCO responded:

See our S351-30 or S390-30. 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, does your old stamp read 29 1? If so, choose 2910 as a new stamp option.

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