Replaement Window Balance

A handy person from Winter Springs Florida says:
October 24, 2011
I have a non-tilting windows that has a channel balancer that is 30" long and 1/2" wide. From the picture it most resembles the series 380 and the series 385 channel balancer.

I attached 2 pictures of the channel balancer I removed from the window.

Any help in choosing the correct channel balancer would be greatly appreciated.
A customer submitted photo of a window balance.
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Mike from SWISCO responded:
October 26, 2011
Thanks for posting.

Could you please supply us with the measurements of the bottom attachment, as well as the stamp number?
A handy person from Winter Springs, FL says:
October 26, 2011
The Stamp number is 28C USB
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Paul from SWISCO responded:
October 27, 2011
Please take a look at our S385-29 Channel Balance with the 2830 option.
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