How do I identify between 38-163 and 38-164?

A quick learner says:
Which one should I choose for the window in the image? Thanks
User submitted a photo of window hardware.
Profile picture of Tom
Tom from SWISCO responded:
I cannot tell if either lock will work for you based on this picture alone. All I can see is part of the handle and part of the base. The only way to know for sure is to remove what you have installed now and match the entire mechanism up to our pictures and dimensions.
A home owner from Lexington, Ma. says:
I've just replaced this exact part.
Purchased part #38-164

Agree with SWISCO rep, always safer to remove failed assembly and match up to posted pictures.
However, if I were a betting man I would say part # 38-164 is the correct one.

With that said, I now need part # 38-163 as the other side just broke!!!
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