Mack U Side Marker Bulb Size
The Mack U front and rear side marker bulbs both utilize a 1891 bulb size. The replacement chart covers vehicle production spanning 1981 to 1989.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Front Side Marker
| Years | Bulb Size |
|---|
| 1981-1989 | 1891 |
Rear Side Marker
| Years | Bulb Size |
|---|
| 1981-1989 | 1891 |
Bulb Specifications
| Description |
Bulb Size |
| ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W. | 1891 |