Chrysler St Regis front and rear turn signal bulbs use 1034 or 1129 size specifications. The replacement chart covers 1955 to 1956 production 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 Chrysler St. Regis uses two distinct bulb types across its model years: the 1034 for 1956 and the 1129 for 1955, applied to both the front and rear turn signal positions in each respective year.
Both the 1034 and 1129 are ANSI-standardized bulbs recognized in the US and Canada, meaning they conform to a defined set of electrical and physical standards rather than being proprietary or regionally exclusive parts.
Each bulb type carries a dual-filament design, which allows a single bulb to serve two separate lighting functions, typically a brighter filament for turn signaling and a dimmer one for a secondary function such as running or parking light duty.
Both bulbs operate on a 12-volt electrical system with a 21/5W power rating, where 21 watts corresponds to the brighter filament and 5 watts to the dimmer filament.
The 1034 and 1129 share the BAY15d bayonet base, a two-pin offset base type where the two pins are positioned at different heights to ensure correct orientation during installation and prevent incorrect filament alignment.
Both bulb types are described as variants of the 1157, a widely produced dual-filament automotive bulb, indicating close electrical and physical similarity to that standard reference type while differing in specific rated output or construction details.
Because the 1034 and 1129 share the same base type, voltage, and wattage rating, physical fitment between the two may be possible, though substitution without confirming exact ANSI specifications against the vehicle's original equipment is not advised.
The front and rear turn signal positions on the Chrysler St. Regis use the same bulb type within a given model year, with the 1034 covering both positions in 1956 and the 1129 covering both positions in 1955.