Replacement Window channel balance stamped with 21 D

A home owner from Vancouver, WA says:
Hi, I have a trashed window balance with "21 D" etched on the back. The house was built in 1985 and the balance doesn't have a manufacture's name on it. It measures 22" length X 1/2" width X 5/8" deep. I would like to order a replacement including the top and bottom plastic pieces attathed. Can you accomodate this order?

Thanks, Tom
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Tom from SWISCO responded:
Thanks for posting, Tom. I can't say for sure what you need based on this information alone. I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have.
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