Plymouth Colt high beam and low beam headlight bulbs both utilize the H6054 bulb size. The replacement chart covers 1983 to 1986 model years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Plymouth Colt uses the H6054 bulb size for both high beam and low beam headlights across the 1983-1986 model years.
The H6054 is an ANSI-standardized sealed beam unit recognized across the United States and Canada, meaning the specification follows a regulated format rather than a proprietary design.
A sealed beam unit integrates the filament, reflector, and lens into a single fused assembly, so when the filament fails, the entire unit requires replacement rather than just an internal bulb.
The H6054 follows a 5x7-inch rectangular form factor, which is a common standardized size shared across many vehicles of that era, making the unit widely available through general automotive supply channels.
The H6054 operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles of this type.
Because the same H6054 unit serves both the high beam and low beam positions on the Plymouth Colt, the two positions are not served by separate bulb types, which simplifies parts sourcing.