The GMC PM252 uses a 63 bulb size for both front and rear side marker positions. The replacement chart covers 1952 to 1955 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 bulb size 63 is an ANSI-standardized type recognized across the United States and Canada, making it a regionally consistent specification within North American automotive applications.
The GMC PM252 uses the size 63 bulb for both front and rear side marker positions across the 1952-1955 model years.
The size 63 bulb operates on a 12-volt electrical system at a rated wattage of 0.63W, placing it among the lower-wattage bulb types used in automotive marker lighting.
The BA9s base is a miniature bayonet fitting with a 9mm cap width, a base type commonly associated with small indicator and marker lamp applications.
The size 63 is a single-filament bulb, meaning it serves one lighting function per socket rather than combining roles such as running and braking signals into a single unit.
The identical bulb specification across both the front and rear side marker positions on the GMC PM252 means a single bulb type satisfies both fitment requirements on the vehicle.