Do I need S380 Balance

A quick learner from NJ says:
Hi,

I don't see any markings on the channel balance except one of them says 2740. Looking at the pics do I need S380 channel balance or something other. What other parts would I need to order. Attaching picture.

Very much apprecaite your help.

User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
I'm afraid I can't confirm if the Series 380 is a match. It could be that, or the Series 385 instead. The only difference between these two is the depth of the shoe. You will need to measure your shoe to confirm the best replacement option.
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