non-tilt channel balance 2730

Question

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.

Tom · Accepted Answer

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.