Winged Tilt Latch

A home owner from Lancaster, PA says:
Have some tilt latches I need to replace. Thought I tracked them down on Amazon but the ones that I received were too big (see comparison picture). The one I need is the smaller of the two. The larger one has number 8590 on it. The smaller one (which I need) is not labeled with anything. One Window Sash has model numbers of 52-8508-WHT and 52-8506-WHT listed. I really need to find some of these latches.
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Bob from SWISCO responded:

See our 26-266 & 26-267, or perhaps our 26-408. Look over the dimensions and see if either of these pairs is a good match. 

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