Window channel balance 17"

A home owner from Florida says:
Hello!
I'm looking for a window channel balance 17" 1610 Q. Please, let me know which one I need to buy!
Thank you,
Anna
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Bob from SWISCO responded:

Thanks for contacting SWISCO. Based on the characteristic nylon attachments and the length you have provided, this looks like either our S351-17 or S390-17 Channel Balances. The only difference between these two kinds of balances is the depth of the bottom nylon shoe. The Series 351 has a bottom nylon shoe with a depth of 1"; whereas the Series 390 has a bottom nylon shoe with a depth of 1-1/8". Compare with your old part and see what matches best. 

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