Looks like these are "weather shield". Can't find exact replacement parts, looking for parts that will work with the way it's inset. Believe it's 4.5"
Emily from SWISCO responded:
December 1, 2023
Hi there!
Thank you for reaching out to us. Would it be possible for us to see the bearing at the end of the operator's arm? Our 39-027E and 39-028E operators come to mind but I don't know what the bearing looks like at the end of the arm for yours.