Need help finding replacement

A quick learner from MI says:
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"
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Emily from SWISCO responded:

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. 

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