Need a pair of balancer for a single hung window

A home owner from California says:
One of the balancers is broken. The markings say 2740 D. Please see the attached photographs

The balances are 28" long.

Thank you

Anup
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Jasmine from SWISCO responded:

Hey there, thanks for writing in! It looks like you have either the S351-28 with a 1" shoe or the S390-28 with a 1-1/8" shoe. To determine which series is needed for your window. Look over the dimensions from the diagram below to confirm the depth of your bottom shoe. You'll need to select the 2740 stamp.

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

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