sash window channel with ends

A quick learner from 06067 says:
Need to know will will be a compatible channel to replace BSI 2140 with the ends shown in the picture
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Emily from SWISCO responded:

Hey there!

It looks like you have either our S351-22 , with a 15-002 bottom attachment, or S390-22 , with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You will also need a 2140 spring strength option.

If you have any questions just let us know!

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
A quick learner from 06067 says:
Thank you for the input , it was really helpful. I think I need the 15-001 but I didn't get what you meant by I will need 2140 spring strength option ? I am gonna order a 2140 channel with 15-001 end .
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Emily from SWISCO responded:

The stamp on your metal channel indicates the weight range your balance is calibrated to support. Your stamp reads "2140" which means you'll need to choose the 2140 option on the S390-22 or S351-22 product pages. Let me know if this makes sense or if you had any questions. 

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