Thank you for posting. Have a look at our 39-350 operator. The mounting location seem to match up to yours, however, the link arm is not off set and uses a shoulder screw at the end to mount it to the linkage in the window. Give it a closer look and let me know your thoughts.
Hey there. I would review our pictures again. The top hole of the 39-350 has the same side offset as your original. You can see it more clearly in the image below. You may not have to drill anything, hopefully!
Right and left are kind of a weird thing in this industry. Every manufacturer defines them in different ways; sometimes it's what side the crank is on, sometimes it's what side of the window it's on, sometimes it's from the outside looking in, and sometimes it's from the inside looking out. There's no industry standard. Don't worry about left or right, worry more about details like what side the arm and tab face, where the link arm rests, etc.
![How to Replace an Awning Window Operator [1080p]](../../images/videoThumbnails/83.jpg)