When doing replacement or upgrading on 1973 – 1974 Volkswagen Thing, the bulb size guide is necessary for you to take the reference.
| High Beam and Low Beam Headlight | 1973 – 1974 | H6024 |
| Back Up Light | 1973 – 1974 | 1156 |
| Brake | 1973 – 1974 | 1156 |
| Dome Light | 1973 – 1974 | DE3423 |
| Front Side Marker | 1973 – 1974 | T4W |
| Front Turn Signal | 1973 – 1974 | 1156 |
| License Plate | 1973 – 1974 | 12821 |
| Parking Light | 1973 – 1974 | 12929 |
| Rear Side Marker | 1973 – 1974 | T4W |
| Rear Turn Signal | 1973 – 1974 | 1156 |
| Tail Light | 1973 – 1974 | 12821 |
| Courtesy | 1973 – 1974 | DE3175 |