When doing replacement or upgrading on 1958 – 1996 Buick Roadmaster Sedan Wagon, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight 1958 H5006
High Beam Headlight 1958 H5001
High Beam and Low Beam Headlight 1991 9004
Back Up Light 1958 1156
1991 2057
Brake 1958 1034
1991 2057
Dome Light 1958 1004
1991 561
Front Side Marker 1991 24
Front Turn Signal 1958 1157
1991 2057
License Plate 1991 24
1958 67
Parking Light 1958 1157
1991 2057NA
Rear Side Marker 1991 194
Rear Turn Signal 1958 1034
1991 2057
Tail Light 1958 1034
1991 2057
Center High Mount Stop Light 1991 561
Courtesy 1991 194
Engine Compartment Light 1991 561
Glove Box 1991 1891
Map Light 1991 192
1958 90
Radio Display 1958 1891
1991 37
Rear Reading Light 1991 194
Trunk 1991 1003
1958 89
High Beam and Low Beam Headlight 1992 – 1996 9004
Back Up Light 1992 – 1996 2057
Brake 1992 – 1996 2057
Dome Light 1992 – 1996 561
Front Side Marker 1992 – 1996 194
Front Turn Signal 1992 – 1996 2057
License Plate 1992 – 1996 194
Parking Light 1992 – 1996 2057NA
Rear Side Marker 1992 – 1996 194
Rear Turn Signal 1992 – 1996 2057
Center High Mount Stop Light 1992 – 1996 1156
Courtesy 1992 – 1996 194
Engine Compartment Light 1992, 1995 – 1996 561
1993 – 1994 562
Glove Box 1992 – 1996 194
Inner Tail Light 1992 – 1996 194
Map Light 1992 – 1996 192
Outer Tail Light 1992 – 1996 2057
Radio Display 1992 – 1996 37
Rear Reading Light 1992 – 1996 194
Trunk 1992 – 1996 920
High Beam and Low Beam Headlight 1992 – 1996 9004
Back Up Light 1992 – 1996 2057
Brake 1992 – 1996 2057
Dome Light 1992 – 1996 561
Front Side Marker 1992 – 1996 24
Front Turn Signal 1992 – 1996 3057
License Plate 1992 – 1996 24
Parking Light 1992 – 1996 3057NA
Rear Side Marker 1992 – 1996 194
Rear Turn Signal 1992 – 1996 2057
Tail Light 1992 – 1996 2057
Center High Mount Stop Light 1992 – 1996 561
Courtesy 1992 – 1996 194
Engine Compartment Light 1992, 1995 – 1996 561
1993 – 1994 562
Glove Box 1992 – 1996 194
Map Light 1992 – 1996 192
Radio Display 1992 – 1996 37
Rear Reading Light 1992 – 1996 194
Trunk 1992 – 1996 920