Citroen DS21 front and rear side marker bulbs utilize a 1895 bulb size specification. The replacement chart covers 1969 to 1972 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 Citroen DS21 uses the 1895 bulb for both front and rear side marker positions across the 1969-1972 model years.
The 1895 is an ANSI-standardized bulb type, meaning its specifications are governed by a defined North American standard used in the United States and Canada.
The 1895 bulb follows the T5 form factor, which refers to a miniature wedge-base construction with a tubular glass envelope roughly 5/8 of an inch wide.
The wedge base design means the 1895 bulb is held in its socket by the glass envelope itself rather than by a separate metal base, which is a common trait of low-wattage indicator and marker bulbs.
The 1895 operates at 12 volts, consistent with the standard automotive electrical system voltage of the DS21's production era.
At 0.9 watts, the 1895 is a very low-output bulb, reflecting its role as a marker light rather than a primary illumination source.
The identical bulb specification across both front and rear side marker positions on the Citroen DS21 means a single bulb type serves all four side marker sockets on the vehicle.