The Peterbilt 520 uses H6054 bulb size for both high beam and low beam headlight applications. The replacement chart covers vehicle production years from 2017 to 2019 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The H6054 is an ANSI-standard sealed beam unit used in both the high beam and low beam headlight positions of the Peterbilt 520 across the 2017-2019 model years.
A sealed beam unit integrates the filament, reflector, and lens into a single non-serviceable assembly, meaning the entire unit is replaced rather than an internal bulb component.
The H6054 follows a 5x7-inch rectangular form factor, which is a standardized size shared across many commercial and industrial vehicle applications.
The Peterbilt 520 (2017-2019) specifies the H6054 exclusively for vehicles equipped with sealed beam headlamps, indicating this fitment applies only under that specific configuration.
The H6054 operates at 12 volts, consistent with standard automotive and commercial vehicle electrical systems.
Because the H6054 is an ANSI-standardized unit recognized in both the United States and Canada, it is subject to regulated performance and dimensional conformity requirements across those markets.
The identical H6054 specification across both the high beam and low beam positions for 2017-2019 suggests the same physical unit serves dual-function roles within the headlamp assembly.