Channel balance

A handy person from Pennsylvania says:
May 2, 2017
I have 25 year old Marvin double hung windows. I need new channel balances for 3 windows. On the current balances the stamp is 20 P and 20 F on the 2 smaller windows and 20 with a bsl on the larger window. Can you help me find replcements? Thanks!
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Tom from SWISCO responded:
May 3, 2017
I'm afraid those stamps aren't part numbers. I'm not sure what to recommend. Can you show me a picture of the balance? I'd like to see a picture of both ends, as well as a picture of the stamp itself. Thanks!
21" Series 751 Channel Balance
21" Series 751 Channel Balance
S751-21
$10.56
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