Tom from SWISCO responded:
October 9, 2017
I just replaced these same latches on my own bedroom window, actually. I used 26-120 and 26-121. 26-228 and 26-229 are really close in size, too, but they're a tiny bit longer (at 3-1/4") than the 26-120 and 26-121, which are 3-1/8" long. That extra 1/8" does make a tiny bit of difference, so measure carefully and pick what's closest.
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