Dodge Custom front and rear turn signal bulbs utilize 1034 or 1154 size specifications depending on production configuration. The replacement chart covers 1954 through 1961 model years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Dodge Custom uses two bulb types across its turn signal specifications: the 1034 and the 1154, both of which are dual-filament bulbs sharing the BAY15d bayonet base.
The BAY15d base is an offset twin-contact bayonet fitting, which physically prevents incorrect single-filament bulbs from being seated in the same socket.
Both the 1034 and 1154 are ANSI-standardized bulbs recognized in the United States and Canada, and both are described as variants of the 1157.
The 1034 operates at 12V with a 21/5W dual-filament output, where the higher wattage filament serves the turn signal function and the lower wattage filament serves a secondary function such as running or parking light.
The 1154 is rated for either 6V or 12V operation, reflecting its origin as an older design intended for vehicles that may have used either electrical system voltage.
For the Dodge Custom, the 1034 bulb applies to both the front and rear turn signal positions across the 1956-1961 model years.
The 1154 bulb applies to both the front and rear turn signal positions on the 1954-1955 Dodge Custom.
Because the 1034 and 1154 share the same BAY15d base, physical fitment between the two is possible, but their differing voltage and wattage ratings make them non-interchangeable without confirming the vehicle's electrical system specifications.