Federal 184

The right one off a criterion. The skirt will hang down to the outside when you put it on the corner. The left rear, tag goes to the rear in the back would be all most flat. Any high top MM would be the same. Now the way to tell is look underneath the motor should go to the outside whither it is right or left.
 
The original light may have been damaged, and this is its replacement. Until the day that the serial numbers of the lights is determined as to a specific day, month, and year, we have no idea exactly when any particular light was manufactured. At best, the only thing that we might ever be able to determine is when a new tag design was started to be used on a particular type of emergency light.
 
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