BMW 760i front inner turn signal bulb uses 3457NA size, while front turn signals require 3357NA or 12961 sizes, and rear turn signals use PY21W or P21W bulb sizes. The replacement chart covers 2004 to 2006 model 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 BMW 760i (2004-2006) uses five distinct bulb types across its turn signal positions: 3457NA, 3357NA, 12961, PY21W, and P21W.
The 3457NA is an ANSI-standard dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W main filament and a 7W secondary filament, and features natural amber glass rather than a clear envelope with a colored lens.
The 3357NA shares the same T25 wedge form factor and natural amber glass as the 3457NA but carries only a single filament rated at 27W, making the two bulbs physically similar yet electrically distinct.
Because the 3457NA (dual-filament) and 3357NA (single-filament) share the T25 wedge base, they may physically seat in the same socket, but substituting one for the other would alter circuit behavior and is not supported by these specifications.
The front inner turn signal on the BMW 760i uses the 3457NA across all three model years (2004-2006), while the front turn signal position uses the 3357NA for its forward-facing element and the 12961 for its side-facing element across the same years.
The 12961 is a Philips-designated miniature wedge bulb in the T10 form factor with a W2.1x9.5d base, rated at 12V and 5W, and serves the side-marker function within the front turn signal assembly.
The rear turn signal position changed bulb types between model years: the 2004 BMW 760i uses the P21W, while the 2005-2006 model years use the PY21W.
The P21W and PY21W are both ECE-standard single-filament bulbs rated at 12V and 21W, but they differ in base type and amber designation. The PY21W uses a BAU15s offset bayonet base and is inherently amber-colored, whereas the P21W uses a BA15s straight bayonet base and produces clear light, relying on the lens for color.
The offset pin arrangement of the BAU15s base on the PY21W physically prevents it from seating in a BA15s socket, meaning the P21W and PY21W are not interchangeable despite sharing the same wattage rating.
The ANSI-standard bulbs (3457NA, 3357NA) are designated for use in the United States and Canada, while the ECE-standard bulbs (PY21W, P21W) follow European and international regulatory classifications.