find the right balancers for vinyl windows

A contractor from San Francisco says:
July 23, 2015
The exisitng balancers have " 20 -3 " stamp.

metal to metal length is 21" , 9 /16" width

Will the 21" series 390 S390-21 2030 match the existing?

Thanks
Freddy
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Tom from SWISCO responded:
July 24, 2015
Hey, Freddy. I honestly don't know if our S390-21 is what you need. All I can tell based on your information is that it's 21" long and uses a 2030 stamp option. The only way to confirm if the Series 390 is right is to make sure its nylon end pieces are the same size as yours.
21" Series 390 Channel Balance
21" Series 390 Channel Balance
S390-21
$9.38
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