Window sash sliding mechanism

Hello, thank you for posting,

Please review the style of the 15-087 pivot shoe that is compatible with the Series 180 coil springs. Compare the dimensions below to confirm a good fit! 

Detail of 15-087

Based on the original stamp, see the S180-06 coil spring that supports 6 pounds of weight. Together with the other side the sash should weigh 12 pounds.

I do not see the mounting bracket in your picture. If needed, review the compatible options on the 15-087 product page to compare to your original. Please review and let us know if you have any additional questions.