Replacement window handle

A home owner from Virginia says:
I'm looking for a replacement window handle to match the one in the images. The back says "8160" and there is also a "3" near the handle. The diameter of the crank is 5/16. Thanks for your help.
User submitted photos of a window operator handle.
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Tom from SWISCO responded:
Can you confirm the size of the spline? Our 39-274 has a spline size of 5/16", but I'm not sure if this is what you need. Let me know!
A quick learner says:
What is the spline?
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Tom from SWISCO responded:
Oh, I'm sorry. The spline is the hole on the handle that fits over the operator's gear bore. If yours isn't 5/16", can you tell me what it is?
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