non-tilt channel balance 2730

A handy person from Albuquerque says:
I need to replace some non-tilt channel balances. These are 28" 2730. I'm guessing they are the 350 series - but can tell for sure (tops and bottoms). Please advise.
User submitted photos of a window balance.
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Tom from SWISCO responded:
This could be either the Series 351 or Series 390 depending on the size of the bottom shoe. That's the only difference between these two balances.
A handy person from Albuquerque says:
thanks!
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