Atrium windows channel balance

A home owner from Goodyear, AZ says:
Would you help us identify the correct replacement part to order?

Metal is 29" long.

Stamp: 28 3 HX CMC 11

About 20 years old.
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Bob from SWISCO responded:

Thanks for posting. Based on the attachments, this looks like an S395-29 Channel Balance to me. For a stamp option, choose 2830. Let me know if you have any questions. 

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