Milgard channel balance.

A contractor from Hendersonville, NC says:
July 5, 2016
I'm trying to determine what is the right channel balance to order for a clients circa 1985 Milgard windows. The measure 21" L 9/16" length and the only stamp on them is 20 C. See attached photos.
User submitted image of their window hardware.
Profile picture of Paul
Paul from SWISCO responded:
July 7, 2016
Please see our S390-21 balance and carefully compare it to your own hardware. I think this may match, but I would just look over our information to be sure. As for the option, I would recommend the 2030 based on your stamp of "20 C."
21" Series 390 Channel Balance
21" Series 390 Channel Balance
S390-21
$9.38
How to Replace a Non-Tilt Channel Balance
How to Replace a Non-Tilt Channel Balance
VIDEO
WATCH >
How to Repair a Jammed Window
How to Repair a Jammed Window
VIDEO
WATCH >
How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
VIDEO
WATCH >
How to replace a non-tilt channel balance
How to replace a non-tilt channel balance
GUIDE
READ >
Choosing a Non-tilt Channel Balance: What Will We Need?
Choosing a Non-tilt Channel Balance: What Will We Need?
GUIDE
READ >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.