2 long sides 11/16" back fin is approx 1/8"-3/16" I work for a glass company and try to help a customer out from a casement window
Paul from SWISCO responded:
February 8, 2019
Greetings -
I believe our 55-156 is the closest snap-in glazing available replacement option in our catalog. Please review the measurements and let us know what you think.