For the 2008 Audi S5, both the low-beam and high-beam headlights use D3S bulbs. The supplied fitment data does not identify a separate projector or non-projector headlight variation, so verify the existing bulb and housing before ordering.
Fog-light fitment is listed as either H11 LED or H16 LED, making this an important area to check against the vehicle’s current setup. The front turn signal uses 64136, while the reverse light and rear turn signal use 921. Rear brake and tail-light applications are listed as 7506R.
The center stop light, daytime running light, and rear side markers are listed as LED assemblies. License-plate and dome lights use 6418. Parking lights, front side markers, courtesy, glove-box, map, and trunk lights are listed with 2825 or 98 options, so confirm the original bulb style when replacing these locations.