BMW 750i front inner turn signal bulb uses 3457NA size, while front turn signal bulbs measure 3357NA or 12961, and rear turn signal bulbs are 12496 or PY21W in size. The replacement chart covers 2006 to 2008 model production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The BMW 750i uses five distinct turn signal bulb types across its front and rear positions for the 2006-2008 model years: 3457NA, 3357NA, 12961, 12496, and PY21W.
The 3457NA and 3357NA are both ANSI-standard T25 wedge bulbs with natural amber glass, rated at 12V and designed for the US and Canadian markets. The key difference between them is filament count: the 3457NA is dual-filament at 27W/7W, while the 3357NA is single-filament at 27W.
The dual-filament 3457NA serves the front inner turn signal position on the BMW 750i across all three model years covered, 2006-2008.
The single-filament 3357NA fills the front-facing position of the front turn signal assembly for 2006-2008, while the 12961 miniature wedge bulb serves the side position of that same assembly.
The 12961 is a Philips part number for a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W, representing a significantly lower wattage than the other turn signal bulbs in this application.
The rear turn signal bulb for the 2006 BMW 750i is the PY21W, an ECE-standard single-filament amber bulb with a BAU15s bayonet base rated at 12V and 21W, a fitment type common in European-market vehicles.
The rear turn signal for 2007-2008 uses the 12496, a Philips/Osram halogen bulb for specialty applications rated at 12V, which differs from the PY21W used in the 2006 model year.
The BAU15s bayonet base of the PY21W is an offset single-contact base, which is not interchangeable with the more common BA15s base. This distinction is relevant when sourcing a replacement for the 2006 rear turn signal position.
The T25 designation shared by the 3457NA and 3357NA refers to bulb body size, but the difference in filament count means these two types are not functionally interchangeable despite their physical similarity.
The front turn signal assembly on the BMW 750i for 2006-2008 requires two separate bulbs per side, one for the forward-facing position and one for the side marker position, each with a different bulb type and wattage rating.