Geo Storm headlight bulbs utilize H4352 and H4701 sizes for high beam applications, while low beam functions require H4351 and H4703 bulb sizes. The replacement chart covers 1990 through 1993 production years 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 Geo Storm uses two distinct sealed beam sizes across its model years: 5.75-inch round units for 1992-1993 models and 7-inch round units for 1990-1991 models.
All four bulb types found in these specifications, H4351, H4352, H4701, and H4703, conform to ANSI standards applicable in both the United States and Canada.
Each bulb type in these specifications is a sealed beam unit, meaning the lens, reflector, and filament are fused into a single assembly. When the filament fails, the entire unit requires replacement rather than an internal bulb swap.
All sealed beam units listed operate on a 12V electrical system.
The H4352 high beam unit is designated as a variant of the H4351 low beam unit. Both share the 5.75-inch round sealed beam format, though they are not interchangeable due to their distinct beam pattern designations.
The 1992-1993 Geo Storm uses H4352 for high beam and H4351 for low beam, while the 1990-1991 Storm uses H4701 for high beam and H4703 for low beam. Substituting a unit from one generation's fitment into the other is not supported by these specifications.
The H4701 and H4703 7-inch round sealed beam units used in 1990-1991 models are among the most historically common sealed beam sizes in North American automotive lighting, a format standardized for broad compatibility across that era.