39-107fk folding crank for paramount casement windows?

A home owner from Long Beach CA says:
I'm wondering if the 30-107fk will work to replace my existing handle and cover. The opening is 5 inches x 1 1/8. Also, what is the cover made of? Thanks!
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Casey from SWISCO responded:

Thanks for writing in. I agree that the 39-107FK looks like a good substitute. These parts are plastic. 

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