Please Help me Identify the Part

A home owner from 95138 says:
Hello, Please help identify the part with the link to purchase. All 4 of my windows need the parts to replace.

It stamps 31 3 CX CMC 7.

Thank You Very Much.
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Bob from SWISCO responded:

Thanks for writing in. See either our S380-32 or S385-32. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 3130.

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