Channel Balance Replacement

A handy person from Orlando, FL says:
August 12, 2016
Stamped 28C It's a 1/2 x 1/2 inch channel 29 inches long.
Window does not tilt in
Bottom sash weighs 18 lbs

The plastic pieces don't look like the ones on your site. Similar but different. Entirely enclosed with the channel.

The window is about 7 years old but I don't know the mfg. and there is no sticker on it. It's a new home (7 yrs old) that was built by Beazer Homes.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
August 16, 2016
It's difficult to tell what can work. Your shoe looks different from ours because much of it has broken off. I think if you were to find a whole one, it'd resemble our 15-004 or 15-005. In that case, I'd recommend either our Series 385 or Series 380 balances, respectively.
Winged Channel Balance Shoe, 1-3/32" Depth
Winged Channel Balance Shoe, 1-3/32" Depth
15-004
$0.74
Winged Channel Balance Shoe, 1" Depth
Winged Channel Balance Shoe, 1" Depth
15-005
$0.74
How to Replace a Channel Balance Attachment
How to Replace a Channel Balance Attachment
VIDEO
WATCH >
Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
GUIDE
READ >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.