Replacement window cranks

I cannot confirm whether our 39-074 can work without knowing your dimensions. Looking at the photos of your awning window, I suspect that the operator you have now isn't the original that came with the window. It looks like an after market product. 

If possible, I'd like you to remove the operator from the window so that we can see the gearing and link arm. I would also like to know its dimensions, especially the screw hole center placement. If you happen to have a window that still has the original hardware, that would also be a big help.

Thank you! After reviewing your dimensions, I agree that our 39-074 is the best match we have. The only significant difference appears to be the size of the link arm, but the difference is negligible. I don't think that will prevent the 39-074 from working.