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Old 08-07-2020, 03:15 PM   #5
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Join Date: Jun 2010
Location: San Antonio, Texas
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Default Re: can some one please give me the dimenions of the base of roof antenna

Some of the Monarch parts are the same as Mercury cars of the same model design and year but you never know about those Canadian Fords. Ford Dearborn used one for Ford & Mercury sedans/coupes P/N 21A-18813 and one for convertibles/wagons P/N 21A-18813-A but they were likely changed to 51A prefix numbers after the war. Are you wanting to know the size of the part that goes through the roof?
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