Hello, thank you for posting,
To further review, we will need additional pictures of the window open where we can see a bird's eye view of the full operator and arm attachment(s). Thank you!
Thank you for the additional pictures,
Please start with reviewing the dimensions of the 39-031 and 39-032 or 39-155 and 39-156 operators to see how they compare to your original. The difference between these two styles is the length of the short link arm. Let us know if you have any additional questions!
Hello,
Please measure as shown below:
Once you determine which style your window uses, you will also need to review the orientation of the arms and gear to choose the correct operator. Let me know if you have any additional questions.