Replacement cover part

A quick learner from Lowell, MA says:
I want to replace the old operator cover 39-107, with the new style 39-107FK. I was wondering if they are the same size, before I place an order, I want to make sure the new one will cover the hole of the old one?

Thank you for your time!

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Tom from SWISCO responded:
Yes, the 39-107 and 39-107FK are interchangeable.
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