The Hummer H1 front side marker uses a 67 bulb size while the rear side marker requires either a P21W or 93 bulb size. The replacement chart covers vehicle production years spanning 2002 to 2006 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 Hummer H1 front side marker position uses the 67 bulb across the 2002-2004 and 2006 model years.
The 67 bulb follows the ANSI standard used in the United States and Canada. It operates on a single filament with a BA15s bayonet base at 12V and 8W, making it a lower wattage variant of the 1156 bulb.
The Hummer H1 rear side marker position uses the P21W bulb for the 2003-2004 and 2006 model years.
The P21W bulb follows the ECE standard common in Europe and worldwide markets. It is a single-filament signalling bulb with a BA15s bayonet base rated at 12V and 21W, drawing significantly more power than the ANSI-standard bulbs used elsewhere on the vehicle.
The 2002 Hummer H1 rear side marker uses the 93 bulb rather than the P21W found in later model years. The 93 bulb is an ANSI-standard, single-filament type with a BA15s bayonet base rated at 12V and 13W.
The 93 bulb is also a lower wattage variant of the 1156, though it operates at 13W compared to the 8W rating of the 67 bulb used at the front side marker position.
Although the 67, 93, and P21W bulbs all share the BA15s bayonet base, their wattage ratings differ considerably. Direct substitution between them is not supported by these specifications, as each position lists a distinct bulb size for its respective model year.