Need to replace channel balance

A quick learner from Washington Heights says:
I believe my channel balance is a 2930 option but I do not know what series (top and shoe) it is. Please help.
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Emily from SWISCO responded:

Hi there!

It looks like you have either our S351-30, with a 15-002 bottom attachment, or S390-30, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a spring strength option of 2930.

If you have any further questions just let us know!

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A quick learner from Washington Heights says:
Thank you for a thorough reply, Emily! I believe I have the 15-002 version. I will order when needed.
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Emily from SWISCO responded:

Absolutely! If you have any further questions, you know where to find us. 

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