Seasonall double-hung sash lock

Hi there!

Thank you for reaching out to us. Start by taking a look at the 90-077A. This sash lock measures 2-1/16" on the installation hole centers with a 7/16" backset. You'll want to make sure your old lock measures the same.

Please let us know if you note any discrepancies. 

Alternate image for 90-077A