For window

Hi there!

Thanks for reaching out to us. It looks like your operator's arm may have an offset but I'm not certain. If it does, take a look at the 39-413. If it doesn't, see the 39-028E. I recommend you review our specifications and compare them with yours to determine if one of them matches up. 

Let us know if you note any discrepancies. 

Dimensions for 39-028e

Alternate view of 39-413

Alternate image for 39-413