The Rover 2000 front turn signal uses a P21W bulb size while the rear turn signal requires a 1156 bulb size. The replacement chart covers 1969 to 1971 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 Rover 2000 uses two distinct bulb standards across its front and rear turn signal positions for the 1969-1971 model years: the P21W for the front and the 1156 for the rear.
The P21W is an ECE-standard bulb used in European and worldwide automotive markets, operating at 12V with a 21W output and a single filament.
The 1156 is an ANSI-standard bulb used in North American markets, also rated at 12V and 21W with a single filament.
Despite originating from different standardization bodies, both the P21W and the 1156 share the BA15s bayonet base, a single-pin base type where the pin is centered on the base.
The shared BA15s base between the P21W and the 1156 means the two bulbs are physically similar in their mounting interface, though they belong to different regional standards.
The single-filament design of both bulb types indicates they serve a dedicated signalling function, as opposed to dual-filament bulbs that combine multiple lighting functions such as braking and running light in one unit.
The Rover 2000 front turn signal position calls for the P21W across all three listed model years, reflecting a consistent European-standard specification for that position.
The rear turn signal position on the Rover 2000 is specified with the 1156 across the 1969-1971 model years, representing the ANSI-standard equivalent in terms of wattage and base type.