Balances needed to match

A home owner from Las Vegas says:
Can you verify what parts I will need for this balancer.
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Bob from SWISCO responded:

This appears to be either our S380-27 or S385-27. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. Compare both with your old hardware to see what matches best. For a new stamp option choose 2640.

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