Cadillac Eldorado Headlight Bulb Size

Additional Notes

• The H6024 is a 7-inch round sealed beam unit operating at 12V and serves as both the high beam and low beam source for the Cadillac Eldorado across the 1953-1957 model years. As a sealed beam design, the entire unit is replaced rather than an internal filament or capsule.
• The H5001 and H5006 are sealed beam units used in tandem on the Eldorado from 1958-1974, with the H5001 handling high beam duty and the H5006 handling low beam duty. The H5001 is a 4-inch square unit, while the H5006 is a 5.75-inch round unit, both operating at 12V.
• From 1975-1985, the Eldorado used 4x6-inch rectangular sealed beam units across both beam functions. The high beam position used the H4651 throughout this period, while the low beam position alternated between the H4652 and H4656 depending on the model year. All three types are sealed beam units replaced as whole assemblies.
• The H4652 is classified as a variant of the H4651, meaning the two share a common form factor within the 4x6-inch rectangular sealed beam family, though they are not interchangeable between beam positions.
• From 1986-1991, the Cadillac Eldorado used the 9004 bulb for both high and low beam functions. The 9004 is a dual-filament halogen bulb with a P29t base rated at 12V, with separate wattage ratings of 65W for high beam and 45W for low beam within the same capsule.
• Beginning with the 1992 model year, the Eldorado transitioned from the dual-filament 9004 to a split system using two separate single-filament bulbs: the 9005 for high beam and the 9006 for low beam. This configuration continued through the final 2002 model year.
• The 9005 carries a P20d base and is rated at 65W, while the 9006 uses a P22d base and is rated at 55W. Although both are single-filament halogen bulbs operating at 12V, their base types differ and the two are not interchangeable with each other.
• All bulb types listed across the full model range conform to ANSI standards applicable in the United States and Canada, covering both the sealed beam units used in earlier model years and the replaceable halogen capsules introduced in later configurations.