replacement balances

A quick learner from California says:
Can I order these on line if so email me the number so I can go and process the order now thanks. I need the number that you use to match mine thanks
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Paul from SWISCO responded:

Thank you for your inquiry. Both our S351-28 and S390-28 balances look compatible with your part. The only difference between these two balances is the depth measurement of the bottom balance shoe. The depth measurement of the bottom shoe for the Series 351 is 1" and for the Series 390 is 1-1/8". You will need to measure the depth of your bottom shoe, like in the diagram below, to determine which balance is the best match for you. Since your stamping does not match any of our options, you will need to weigh your sash on a scale and refer to the sash weight chart on the store page to decide on the most appropriate stamp option.

Comparison of 15-001 & 15-002

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