When doing replacement or upgrading on 1977 – 1989 Dodge Diplomat, the bulb size guide is necessary for you to take the reference.

1977 – 1989 Dodge Diplomat Bulb Size Guide
Low Beam Headlight	1977 – 1989	H4656
High Beam Headlight	1977 – 1989	H4651
Back Up Light	1977 – 1989	1156
Brake	1977 – 1989	1157
Dome Light	1977 – 1978	211-2
	1979 – 1980, 1982, 1984 – 1989	578
	1981, 1983	912
Front Side Marker	1977 – 1989	168
Front Turn Signal	1977 – 1981	1157
	1982 – 1984	2057
License Plate	1977 – 1989	168
Parking Light	1977 – 1979	1157
	1980 – 1983, 1985 – 1989	194
	1984	2057NA
Rear Side Marker	1983 – 1984	1157
	1977 – 1979, 1982	168
	1980 – 1981, 1985 – 1989	194
Rear Turn Signal	1977 – 1989	1157
Tail Light	1977 – 1989	1157
Front Inner Turn Signal	1985 – 1989	2057NA
Front Outer Turn Signal	1985 – 1989	194NA
Center High Mount Stop Light	1986	1156
	1987 – 1989	921
Courtesy	1979 – 1981	161
	1984	212-2
	1977 – 1978, 1982 – 1983, 1985 – 1989	90
Engine Compartment Light	1977 – 1978, 1981 – 1985	1003
	1986 – 1989	105
Glove Box	1980 – 1989	1891
	1977 – 1979	1893
Map Light	1977 – 1980	562
	1981 – 1989	912
Radio Display	1980 – 1983	158
	1977 – 1979	194
	1984 – 1989	74
Trunk	1977 – 1985	1003
	1986 – 1989	105