crank operator - replacement

A handy person from Mesa, CO says:
Greetings - I have some left and right hand operators that are failing.
They are labeled Truth 31850. Are there a recommended replacement for these Operators? These did not seem to last very long.
If not, is there a part number to reference on ordering right and left operators?
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Emily from SWISCO responded:

Hi there!

Thanks for reaching out. Your operator looks like an older version of our 39-315 and 39-316. Have a look at our dimensions and compare them with your old assembly to see what you think!

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