this is a common question often asked, I don't know that there is an actual constant size used, myself I used a stud finder to determine the limits of the backing plate in the bedroom of my rig.
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Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
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