Channel balances

A quick learner from Southern CA says:
I need two new channel balances
They are for a vinyl single hung window.
I have attached 4 pictures of old channel balances
Which are 27 inches long. The window weighs approximately 18 pounds.
Thanks!
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Tom from SWISCO responded:

Thanks for your photos. Based on what I see here, you have either our S380-27 or S385-27, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.

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