Block and Tackle Window Balance

A home owner from Ventura, CA USA says:
Need replacement block and tackle window balance. Part number 2730. Guides are non-winged style. Width is 1/2"
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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. 

The length of the metal channel excluding the nylon attachments should measure 28" long and you will need a 2730 stamp option. Please review and let me know if you have any additional questions! 

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

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