Sash Balance Anderson Window Double Hung 31.5W x 53 H
A quick learner from Shrewsbury, PA says:
June 9, 2014
This picture is the best I can get of the numbers on this sash balance unit. I can't match the numbers to anything listed on your page. I have many windows of idental measurements and these things are breaking/tearing. I'll need at least 8 units (4 windows worth) to start with.
Tom from SWISCO responded:
June 10, 2014
Check out our 24-737. This can replace Andersen balance boxes with a stamp of 7#27.