| Location | Size | |
| Rear Side Door | 1" | |
| Front Side Door | 5.25" | |
| Front Side Door | 1" | |
| Rear Deck | 6.5" |
1999 Audi A4 Car Audio and Video Parts & Accessories
Speakers:
Lighting:
| Location | Bulb | |
| Back Up Light | P21W | |
| Brake | P21/5W | |
| Center High Mount Stop Light | 12961 | |
| Courtesy | DE3423 | |
| Dome Light | 6411 | |
| Engine Compartment Light | 6411 | |
| Fog Light | H7 | |
| Front Fog Light | H7 | |
| Front Inner Turn Signal | 2357NA | |
| Front Side Marker | 2357NA | |
| Front Turn Signal | 12961 | |
| Front Turn Signal | 3757NA | |
| Glove Box | DE3423 | |
| High Beam Headlight | H7 | |
| License Plate | 12844 | |
| Low Beam Headlight | D2S | |
| Low Beam Headlight | H7 | |
| Map Light | 12961 | |
| Parking Light | 2357NA | |
| Rear Side Marker | 12961 | |
| Rear Turn Signal | P21W | |
| Side Marker | 12961 | |
| Stepwell | 12961 | |
| Tail Light | P21/5W | |
| Trunk | DE3423 |
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