I believe the 54 is set up the same as V8 models. If so, with only the one heater you will have a switch on the left in 54 and the corresponding space on the right will have a blank fill piece. That blank piece is removed and a setup similar to the left switch is installed. The difference may come with labeling. I don't remember how 54 did it but in 55-6 the two actual function or fill pieces were labeled differently so that would be a consideration. The actual mount and switch assy is most likely identical between sides.
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