The plastic cover along the window frame is 4 inches.
Tom from SWISCO responded:
November 10, 2021
Hello there! I believe you have an older version of our 39-315 and 39-316, which both happen to be closely associated with the same 31850 number printed on yours. Check these parts over and let me know what you think!
A quick learner from Sonoma California says:
November 10, 2021
Thank you - I will order a couple of the 39-315 operators.
Tom from SWISCO responded:
November 11, 2021
Awesome, thank you very much for the order! Please let me know how they work out or if you had any follow up questions.