Identifying replacement balance

A quick learner from Elkridge, MD says:
Greetings. Attached are photos of the ends of my balance. It is 28.75" long (metal part only), so I presume this is a "29-inch" balance. It is also 9/16" wide (1/2 series, right?). Stamped on it is 2830 Q. The closest match I could find on your site was series 371 with the 19-031 and 15-005 ends. Does this look right?

Thanks!
Dan
A customer submitted photo of channel balance attachments.
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Paul from SWISCO responded:
Thanks for posting, Dan. It appears that our S371-29 channel balance with a 2830 stamp option is our closest possible match. Please also take a look at our 18-123 and 18-124 top sash guides, just in case.
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