Can you confirm that I have the Series 351

A home owner from Jacksonville FL says:
Channel Balance for 2820 (2) and 2830 (2) needed, part S351-29. Went through all steps for ordering online with measurements and specs. Am attaching photos to this inquiry to confirm parts ordered are correct - Series 351 for windows installed in 1986. 29", with top 1/2" x/ 1/2" x 1.25" and shoe at 1/2" x/ 1" x 1". Please advise if the parts ordered are incorrect after reviewing the photos attached and info provided.

User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Hey, Steve. I'm afraid I can't confirm that the Series 351 is correct. All I can see is your stamps and a small portion of the top attachment.

The best way to confirm if the S351-29 is correct is to carefully compare our pictures and measurements to your own hardware. I would also carefully go over the pictures and dimensions for the parts that come attached to the S351-29: the 19-002 and 15-002.
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