Emily from SWISCO responded:
June 12, 2023
Thank you for reaching out to us! I'm not convinced the 90-137 is what you have here. Can you write out the distance between the two installation holes, measured from center to center? I would also like you to write out the backset which is shown in the image below as 11/16". Can you also show us a photo of the keeper removed from the window? I can't promise we will have a suitable replacement but we will try our best. Dimensions for 90-278
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