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Hello, thank you for posting,

We do not carry an exact replacement, but we recommend taking a look at the 15-251 inverted single support. Even though it is different in length, it should not be an issue with installation. Your original part is marked with a "10", please see the S160-10 for a compatible coil spring along with the 16-032 mounting clip.

Review all dimensions to see what you think! Together with the other side, the total weight of the window sash should be 20 pounds. Please let me know if you have any additional questions! 

Measurements of 15-251