replacement balance

A contractor from Florida says:
Hi- Trying to locate a replacement balance (non tilt, 1/2" channel)used in a window built by NuAir in Tampa Fl. (they are out of business) I am having trouble doing an ID from the pictures on your web site. Can I send you pictures of what I have? Also, the balance is lifting insulated glass and would need a heavy spring. There is an ID printed on the old unit-- 34 5 HV CMC O Does this code help?

The sash weighs 30 lbs and is non tilt out. the length of the metal part is 35 inches and the ends are winged. From the hemmed edge to the back is 19/32" and 1/2" across the back.

Thanks, Doug M. Tampa Bay, Fl.
User photo of their NuAir 34 5 HV CMC O channel balance.
Profile picture of Donna
Donna from SWISCO responded:
Thank you for sending us the detailed images. Your balance attachments look like our 19-005 top and 15-004 shoe. See our series 385 replacement balance.
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