Replacement for Milestone Series 1000 SH Aluminum from Florida Extruders International, Inc.

A home owner from Clermont, Florida says:
Florida Extruders, the manufacture, is out of business. I have several windows that the springs have broken. Balances measures from metal end-to-end 29" with a width of 9/16". Channel is stamped with 28F only. Other information from the label on the windows is: Car # 279-170 Model 1000 SH Rating: H-LC45 1349X1600" (53X63"). I need sets of channel replacements for 3 windows this size. Please advise if you have an acceptable replacements.
User submitted photos of a window balance.
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Tom from SWISCO responded:
I would start by looking at our Series 380 channel balance. I believe this could be a match, but look it over and see what you think.
A home owner from Winter Garden FL says:
Clermont homeowner, did you find a channel that worked?
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