Replacement parts

A quick learner from Farmington Hills, MI says:
May 26, 2012
I am looking for replacemenr balancers for two windows.
I have attached the pictures of the parts I am looking for.
The stamping says BSL 24 c
I believe I heed to replace the tracks and the pulleys and strings. The spring looks OK.

Can you tell me if you carry this part and who much would be the costelp me
A customer submitted photo of channel balance attachments.
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Paul from SWISCO responded:
May 29, 2012
Thanks for posting! Please see our S390-25 channel balance with the 2430 stamp option. Do you think this might work for you?
A handy person from Michigan says:
June 4, 2012
Paul, thanks for the response. I checked the dimensions and it looks like I need 15-002. It looks Like I need series S390-25 but 15-002 in place of 15-001.
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Paul from SWISCO responded:
June 5, 2012
That would be our Series 351 channel balance. Is that a closer match?
25" Series 351 Channel Balance
25" Series 351 Channel Balance
S351-25
$10.77
25" Series 390 Channel Balance
25" Series 390 Channel Balance
S390-25
$10.55
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