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This one may be a tough one without a part number or model on unit.These things were from early 1970s.Doing a Google search the only one I even came across was the LH680515.
Here is a link, but does not show picture.
Says unavailable right now though. There is a phone number that you might call and get better info on the part.
Do not rate answer until we have seen if info was helpful or not.
Here is another link with a picture and shows available, but again not sure if the one you need