Volkswagen Scirocco front and rear side marker bulbs utilize the P21/5W and 3893 bulb sizes respectively. The replacement chart covers 1975 to 1988 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 Volkswagen Scirocco front side marker uses two distinct bulb types across its production span, with 1975-1981 models fitted with the 3893 and 1982-1988 models fitted with the P21/5W.
The rear side marker position uses the 3893 bulb across all model years covered by the specifications, from 1975 through 1988.
Both the P21/5W and the 3893 share a BAY15d bayonet base, which is a dual-contact offset-pin fitting designed to prevent incorrect bulb orientation during installation.
Both bulb types carry dual-filament construction, meaning each bulb serves two lighting functions within a single housing rather than requiring separate bulbs for each function.
The P21/5W operates at 12V with a 21W primary filament and a 5W secondary filament, with the wattage difference reflecting the distinct brightness levels assigned to each function.
The 3893 is an ANSI-standard bulb, a classification system used in the United States and Canada, while the P21/5W follows the ECE standard used in Europe and other international markets.
Although the P21/5W and 3893 share the same BAY15d base type, they originate from different regulatory standards and are not confirmed as interchangeable by the specifications.
The front side marker position on the Volkswagen Scirocco is the only position in these specifications where a bulb type transition occurs across model years.