There are no manufacturers labels or information. These windows are old and of an unknown age. Top is 2 inches in length by 7/8ths inch wide. The clip under the center is 1/2 inch.
Bob from SWISCO responded:
December 7, 2020
See our 26-235 or 26-119. Confirm the length of those prongs on the underside, as well as the distance between them. See if one of these match. If not, you may need to consider conversion to surface mount tilt latches such as our 26-228 and 26-229. See the video below.