Mack DM Headlight Bulb Size
Mack DM high beam and low beam headlight bulbs utilize 3 distinct sizes each, including H6024, H4651, and H5001 for high beam applications and H6024, H4656, and H5006 for low beam applications. The replacement chart covers vehicle production from 1981 through 1997.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
High Beam Headlight
| Years | Bulb Size |
|---|---|
| 1981-1997 | H6024 (With 2 Round Headlamps) |
| H4651 (With 4 Rectangular Headlamps) | |
| H5001 (With 4 Round Headlamps) |
Low Beam Headlight
| Years | Bulb Size |
|---|---|
| 1997 | H6024 (With 2 Round Headlamps) |
| H4656 (With 4 Rectangular Headlamps) | |
| H5006 (With 4 Round Headlamps) | |
| 1994-1996 | H6024 (With 2 Round Headlamps) |
| H4652 (With 4 Rectangular Headlamps) | |
| H5006 (With 4 Round Headlamps) | |
| 1993 | H6024 (With 2 Round Headlamps) |
| H4656 (With 4 Rectangular Headlamps) | |
| H5006 (With 4 Round Headlamps) | |
| 1992 | H6024 (With 2 Round Headlamps) |
| H4652 (With 4 Rectangular Headlamps) | |
| H5006 (With 4 Round Headlamps) | |
| 1990-1991 | H6024 (With 2 Round Headlamps) |
| H4656 (With 4 Rectangular Headlamps) | |
| H5006 (With 4 Round Headlamps) | |
| 1989 | H6024 (With 2 Round Headlamps) |
| H4652 (With 4 Rectangular Headlamps) | |
| H5006 (With 4 Round Headlamps) | |
| 1988 | H6024 (With 2 Round Headlamps) |
| H4656 (With 4 Rectangular Headlamps) | |
| H5006 (With 4 Round Headlamps) | |
| 1985-1987 | H6024 (With 2 Round Headlamps) |
| H4652 (With 4 Rectangular Headlamps) | |
| H5006 (With 4 Round Headlamps) | |
| 1984 | H6024 (With 2 Round Headlamps) |
| H4656 (With 4 Rectangular Headlamps) | |
| H5006 (With 4 Round Headlamps) | |
| 1983 | H6024 (With 2 Round Headlamps) |
| H4652 (With 4 Rectangular Headlamps) | |
| H5006 (With 4 Round Headlamps) | |
| 1982 | H6024 (With 2 Round Headlamps) |
| H4656 (With 4 Rectangular Headlamps) | |
| H5006 (With 4 Round Headlamps) | |
| 1981 | H6024 (With 2 Round Headlamps) |
| H4652 (With 4 Rectangular Headlamps) | |
| H5006 (With 4 Round Headlamps) |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). 7-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V. | H6024 |
| ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V. | H4651 |
| ANSI standard (US & Canada). 4-inch square sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V. | H5001 |
| ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V. | H4656 |
| ANSI standard (US & Canada). 5.75-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V. | H5006 |
| ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit, variant of H4651. Not a replaceable bulb — the entire unit is replaced. 12V. | H4652 |