The Triumph TR7 high beam and low beam headlight bulbs both utilize the H6024 size. The replacement chart covers 1975 to 1981 production 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 Triumph TR7 uses the H6024 bulb size across all listed model years (1975-1981) for both high beam and low beam headlight positions.
The H6024 is an ANSI-standard sealed beam unit recognized in the United States and Canada, operating at 12 volts.
A sealed beam unit integrates the filament, reflector, and lens into a single fused glass assembly, meaning the entire unit is replaced rather than an internal bulb.
The H6024 follows the 7-inch round sealed beam format, a standardized size that was regulated for use in North American vehicle lighting applications.
Because both the high beam and low beam positions share the H6024 specification across all listed years, the TR7 uses identical units in both headlight functions.
The shared H6024 fitment across both beam positions does not indicate that a single unit performs both functions simultaneously; each position receives its own dedicated sealed beam assembly.