I have two openers, one opens left, the other opens right. Besides that, they appear to be identical. The part number on the back is 40055 and 40056.
They are 13 1/2" from the center of the point the metal arm mounts on to the center of the white roller that goes in the track on the window. I need the arm, the part that mounts to to the window sill, and the handle for both units. Thank you for your help