31 in channel balance

A quick learner from Dublin, ohio says:
Can you please help me identify a replacement balance?
31 inches long, 1/2 width
Stamp of 30 3 JH

The balance is original to windows installed in the late 80s.

Any help is appreciated!
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Bob from SWISCO responded:

Thanks for writing in. See our S380-31 and S385-31. 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. Based on your stamp code, you need a stamp option of 3030. Let us know if you have any other questions. 

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