Window Balance identification

A quick learner from San Diego says:
August 15, 2014
I need some help identifying my channel window balance. It looks like either Series 351 or Series 390, but I'm not sure.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
August 18, 2014
Hey, thanks for posting. You're right, I think this is either our Series 351 or our Series 390 balances.

Now, as you can see, there is only one difference between these two Series, and that is their bottom shoe. The Series 351 uses the 15-002 while the Series 390 uses the 15-001. I can't quite tell what you have based on your pictures, though. Please carefully compare their dimensions to your own hardware and see which is a better match.
Comparison of <a href='Channel-Balance-Shoe/pd/Replacement-Sash-Support-Channel-Balance-Shoes/15-001'>15-001</a> & 15-002
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