I think this is a Milgard window balance, but not sure. the numbers stamped on it read, 28 2. The length of the metal part is 28 7/8", the width of the wings on the bottom shoe is 15/16", the width of the top wings is 15/16".
The window is non tilting channels are 9/16" wide. The windows are approximately 11 years old. windows measure including the vinyl frame, 12" wide and 29 1/2" tall. I am not seeing the tops or shoes that look like mine. I am hoping you can help me out with something that will work. I need four balances like this and will new some for a different size widow.