Frame height necessary to install opertor

What is the minimum height of the frame necessary to re-install a crank operator. The granite piece that is the sill was added later and we don't know how much it covers of the bottom of the frame.
The frame showing above the granite is about 7/8 of an inch. Each window opening is 16 1/4 wide and 35 high. The whole window is 51 3/4 wall to wall and 36 1/2 high. If there is enough room, what product do you recommend ?

Hi Dave.
Thanks for your response.
I answered earlier but it has not become part of this discussion, so I'm not sure if you got it. Here's what I said:
The window was made by Torrance Steel Windows and is probably about 65 years old. If that doesn't help, I'm not at the property so it will take me a couple of days to get you the measurements.
Thanks again for your help with this.
Jeff

Hi Dave,

Here are the measurements you requested. They'll probably make more sense if you refer to the picture that shows the outline of the old operator in the paint.
Beginning at the wall and measuring toward the center, Starting at the center of first hole:

Center of second hole 7/16
Beginning of slot 3/4
End of slot 3 7/8
3rd hole 4 1/4
4th hole 4 11/16
5th hole 6 1/2

I hope that's helpful. Thanks again.
Jeff