32C balance

A quick learner from Duluth, MN says:
I need a replacement balance, and can't figure out which one to order. The metal is 33" long, stamped 32C and BSI (or B5I, 8S1, or something of that mix). I would like the full setup with plastic ends.
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Lauren from SWISCO responded:

Hello, thank you for posting,

It appears you have either our Series 351, with a 15-002 bottom attachment, or Series 390, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. 

You 32C stamp does not directly translate to our options, but we believe you can use a 3230 stamp that can support a 18 to 23 lb  sash weight. We recommend obtaining the weight of the window sash to confirm! 

Please review and let us know if you have any additional questions. 

Diagram on how to choose between the 15-001, 15-002, 15-004, and 15-005 channel balance shoes.
Diagram on how to choose between the 15-001, 15-002, 15-004, and 15-005 channel balance shoes.

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