The H6054 is the sole bulb type across all listed positions and years for the Plymouth TC3, covering both high beam and low beam headlight applications from 1980-1982.
The H6054 is a 5x7-inch rectangular sealed beam unit built to ANSI standards recognized in the United States and Canada. Operating at 12 volts, it functions as a self-contained lighting assembly rather than a housing that accepts a replaceable bulb.
Because the H6054 is a sealed beam unit, the entire assembly requires replacement when the light fails. There is no internal bulb that can be serviced independently.
The Plymouth TC3 uses the same H6054 unit for both high beam and low beam functions, meaning the sealed beam assembly serves a dual-purpose role rather than relying on separate units for each lighting mode.
The H6054 designation follows ANSI standardization, which means the physical form factor is governed by a defined industry specification rather than being proprietary to a single manufacturer. This allows units from multiple suppliers to be interchangeable provided they carry the H6054 designation.