Non-tilt window balance needed

Quick Learner from Glendale, CA
The string snapped and the balance no longer functions. There's a marking on the side that I think reads "21 4 FT CMC 2". Measuring the metal channel only comes out to 22in. Width of channel is 1/2in. I believe the shoe is 1in.
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Quick Learner from Glendale, CA
Also, the window sash weighs about 15lbs.
Casey
Casey from SWISCO
SWISCO
Expert

Hello, thanks for posting! It looks like you could have either our S390-22 or S351-22 with the 2140 stamp option. The difference between the Series 390 and Series 351 lies in the depth of the shoe. Take a look at the picture below for more detail. Once you have determined this dimension you should be able to select the appropriate balance. 

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