Window balance replacement

A quick learner from Altamonte Springs Florida says:
Need to replace window balance making sure I buy the correct one the length is 17 inches and its 1/2 inch wide

Thanks
Steve
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Bob from SWISCO responded:

Thanks for posting. See either our S351-17 or S390-17 Channel Balances. The only difference between these two balance Series is the 'depth' of the bottom nylon shoe. The Series 351 bottom nylon shoe has a depth of 1", whereas the Series 390 bottom nylon shoe has a depth of 1-1/8". Compare with your old balances and see what you think matches best.

Once you know what balance to select, you must choose a stamp option. Your stamp of 16D conforms to our stamp option of 1640, for a window sash in the weight range of 14 through 19 lbs. 

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