Mack LE License Plate Bulb Size

The Mack LE license plate bulb uses a 1891 size bulb for this model. The replacement chart covers vehicle production spanning 1995 to 1997.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1995-1997	1891

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W.	1891

The 1891 bulb is the license plate bulb size for the Mack LE across the 1995-1997 model years.
The 1891 is classified as a miniature wedge bulb, using a T5 form factor, which refers to a tubular bulb with a 5/8-inch body width.
The wedge base design means the bulb is held in place by the socket gripping the glass envelope directly, with no separate metal base or pins involved.
The 1891 operates at 12 volts and draws 2 watts, placing it among the lower-wattage bulbs used in automotive lighting applications.
The 1891 carries ANSI standardization recognized in both the United States and Canada, meaning the specification conforms to a defined North American standard rather than a proprietary or regional-only designation.
The T5 designation describes the shape and body width of the bulb, and bulbs sharing this form factor but differing in voltage or wattage ratings are not necessarily interchangeable, as electrical mismatches can affect socket compatibility and bulb longevity.