Left-Hand Window Crank

A home owner from Florida, USA says:
Unfortunately no model numbers, but I was able to find patent numbers. Just in case it helps, it appears to be D198-202 U. The base is L shaped with an offset hole. Vertical measurement between holes is 4-1/2" from the top hole to the offset one. Horizontal measurement between the two bottom ones is about 1-1/2". The arm appears to be 2-5/8" long and 3/4" wide. Not sure if it helps at all, but I'm in southwest FL and the house was built in the late 1980's. Thanks for any help you can provide!
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Emily from SWISCO responded:

Hello!

Start by taking a look at our 39-258 and 39-259 window cranks. Look over our dimensions and compare them with yours to see if these match up to your original assembly. 

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