Awning operator for a window built in the 60's

This is one old piece of hardware. I'm afraid we couldn't find an exact match for this operator. The closest we have is our 39-017. The top holes are slightly different at 1/2" apart, while the top to bottom spacing is the same at 5-1/4". The link arm is a different size too, but that doesn't matter so much since these windows tend to have a lot of play in the linkage. 

The hole in the link arm, however, may be an issue, as ours is 5/16" and 18 threaded. 

Do you think you could still get this to work in your window? I just couldn't find anything closer.