Need handle piece for an internal tilt latch

A quick learner from Washington DC says:

I have a window where the left side internal tilt latch is missing the handle piece. The specs on the website don't indicate the size of the handle piece and I'm wonder if this item will fit.
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Tom from SWISCO responded:

I'm afraid I can't determine if our 26-345 can work or not. I can't see your current latch so you could have just about anything. Would it be possible to see the original internal latch out of the window? Do you also have one of your old thumb levers that we can see? If you do, I'd also like to know the size and spacing of its forks.

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