When doing replacement or upgrading on 1984 – 1999 BMW 318i 318is 318ti Convertible Sedan, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight 1993 – 1999 9006
1984 – 1985, 1991 H5006
High Beam Headlight 1993 – 1999 9005
1984 – 1985, 1991 H5001
Front Fog Light 1993 – 1999 H1
1991 H3-55W
Back Up Light 1984 – 1985, 1991, 1993 – 1999 1156
Brake 1984 – 1985, 1991, 1993 – 1994 1156
1995 – 1999 1157
Dome Light 1984 – 1985, 1991, 1993 – 1994, 1997 – 1999 578
1995 – 1996 DE3423
Front Side Marker 1991, 1995 – 1996 12961
1993 – 1994, 1997 – 1999 P21/5W
1984 – 1985 T4W
Front Turn Signal 1984 – 1985, 1991, 1993 – 1996, 1999 P21/5W
License Plate 1984 – 1985, 1991, 1993 – 1999 12844
Parking Light 1991, 1993 – 1996 1157
1997 – 1999 12961
1984 – 1985 P21/5W
Rear Side Marker 1997 – 1999 1157
1993 – 1994 P21/4W
1984 – 1985 T4W
Rear Turn Signal 1984 – 1985, 1991, 1993 – 1999 1156
Tail Light 1995 – 1999 1157
1984 – 1985 12814
1991, 1993 – 1994 12821
Front Inner Turn Signal 1997 – 1998 1157
Front Outer Turn Signal 1997 – 1998 12821
Center High Mount Stop Light 1991, 1993 – 1998 1156
Courtesy 1999 6411
1997 – 1998 6418
Engine Compartment Light 1993 – 1996, 1999 578
Glove Box 1991 578
1993 – 1999 DE3423
Map Light 1995 – 1996 6411
Trunk 1997 – 1998 12844
1999 194
1993 – 1994 6411
1984 – 1985, 1991, 1995 – 1996 DE3423
Low Beam Headlight 1992 9006
High Beam Headlight 1992 9005
Front Fog Light 1992 H1
Back Up Light 1992 1156
Brake 1992 1156
Dome Light 1992 578
Front Side Marker 1992 P21/5W
Front Turn Signal 1992 P21/5W
License Plate 1992 12844
Parking Light 1992 1157
Rear Side Marker 1992 P21/4W
Rear Turn Signal 1992 1156
Tail Light 1992 12821
Center High Mount Stop Light 1992 1156
Engine Compartment Light 1992 578
Glove Box 1992 DE3423
Trunk 1992 DE3423
Low Beam Headlight 1992 H5006
High Beam Headlight 1992 H5001
Front Fog Light 1992 H3-55W
Back Up Light 1992 1156
Brake 1992 1156
Dome Light 1992 578
Front Side Marker 1992 12961
Front Turn Signal 1992 P21/5W
License Plate 1992 12844
Parking Light 1992 1157
Rear Turn Signal 1992 1156
Tail Light 1992 12821
Center High Mount Stop Light 1992 1156
Glove Box 1992 578
Trunk 1992 DE3423
Low Beam Headlight 1992 – 1999 9006
1991 H5006
High Beam Headlight 1992 – 1999 9005
1991 H5001
Front Fog Light 1992 – 1999 H1
1991 H3-55W
Back Up Light 1991 – 1999 1156
Brake 1991 – 1994 1156
1995 – 1999 1157
Dome Light 1991 – 1994, 1997 – 1998 578
1995 – 1996, 1999 DE3423
Front Side Marker 1999 1157
1991, 1995 – 1996 12961
1992 – 1994, 1997 – 1998 P21/5W
Front Turn Signal 1991 – 1996, 1999 P21/5W
License Plate 1991 – 1999 12844
Parking Light 1991 – 1996 1157
1997 – 1999 12961
Rear Side Marker 1997 – 1999 1157
1992 – 1994 P21/4W
Rear Turn Signal 1991 – 1994, 1996 – 1999 1156
1995 P21W
Tail Light 1995 – 1999 1157
1991 – 1994 12821
Front Inner Turn Signal 1997 – 1998 1157
Front Outer Turn Signal 1997 – 1998 12821
Center High Mount Stop Light 1991 – 1999 1156
Courtesy 1999 6411
1997 – 1998 6418
Engine Compartment Light 1992 – 1996, 1999 578
Glove Box 1991 578
1992 – 1999 DE3423
Map Light 1995 – 1996 6411
Trunk 1997 – 1998 12844
1993 – 1994, 1999 6411
1991 – 1992, 1995 – 1996 DE3423
Low Beam Headlight 1995 – 1999 9006
High Beam Headlight 1995 – 1999 9005
Front Fog Light 1995 – 1999 H1
Back Up Light 1995 – 1999 1156
Brake 1995 – 1999 1157
Dome Light 1997 – 1999 578
1995 – 1996 DE3423
Front Side Marker 1995 – 1999 12961
Front Turn Signal 1995 – 1999 P21/5W
License Plate 1995 – 1999 12844
Parking Light 1995 – 1999 1157
Rear Side Marker 1997 – 1999 1157
Rear Turn Signal 1995 – 1999 1156
Tail Light 1995 – 1999 1157
Center High Mount Stop Light 1995 – 1996 1156
1997 – 1999 194
Courtesy 1997 – 1999 6418
Engine Compartment Light 1995 – 1996 578
Glove Box 1995 – 1999 DE3423
Map Light 1995 – 1996 6411
Trunk 1997 – 1999 194
1995 – 1996 DE3423