The Ford P-350 front and rear side marker bulbs both utilize a 63 size bulb specification across all configurations. The replacement chart covers 1953 to 1955 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 Ford P-350 uses the type 63 bulb across both its front and rear side marker positions for the 1953-1955 model years.
The type 63 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning it conforms to a shared North American specification rather than a proprietary or regional standard.
It is a single-filament bulb, which means it serves one lighting function only, as opposed to dual-filament bulbs that can handle two functions such as running and braking from a single unit.
The type 63 uses a BA9s base, a miniature bayonet fitting with a 9mm collar and a single locating pin, commonly found in low-wattage indicator and marker applications.
The bulb operates at 12 volts, consistent with the standard automotive electrical systems of that era.
At 0.63 watts, the type 63 draws very little current, reflecting its role as a low-intensity marker light rather than a primary illumination source.
The Ford P-350 uses the same bulb type in both the front and rear side marker positions across all three listed model years, indicating no positional or year-specific variation in this fitment.