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 Headlight1958 H5006
High Beam Headlight1958 H5001
High Beam and Low Beam Headlight1991 9004
Back Up Light1958 1156
1991 2057
Brake1958 1034
1991 2057
Dome Light1958 1004
1991 561
Front Side Marker1991 24
Front Turn Signal1958 1157
1991 2057
License Plate1991 24
1958 67
Parking Light1958 1157
1991 2057NA
Rear Side Marker1991 194
Rear Turn Signal1958 1034
1991 2057
Tail Light1958 1034
1991 2057
Center High Mount Stop Light1991 561
Courtesy1991 194
Engine Compartment Light1991 561
Glove Box1991 1891
Map Light1991 192
1958 90
Radio Display1958 1891
1991 37
Rear Reading Light1991 194
Trunk1991 1003
1958 89
High Beam and Low Beam Headlight1992 – 1996 9004
Back Up Light1992 – 1996 2057
Brake1992 – 1996 2057
Dome Light1992 – 1996 561
Front Side Marker1992 – 1996 194
Front Turn Signal1992 – 1996 2057
License Plate1992 – 1996 194
Parking Light1992 – 1996 2057NA
Rear Side Marker1992 – 1996 194
Rear Turn Signal1992 – 1996 2057
Center High Mount Stop Light1992 – 1996 1156
Courtesy1992 – 1996 194
Engine Compartment Light1992, 1995 – 1996 561
1993 – 1994 562
Glove Box1992 – 1996 194
Inner Tail Light1992 – 1996 194
Map Light1992 – 1996 192
Outer Tail Light1992 – 1996 2057
Radio Display1992 – 1996 37
Rear Reading Light1992 – 1996 194
Trunk1992 – 1996 920
High Beam and Low Beam Headlight1992 – 1996 9004
Back Up Light1992 – 1996 2057
Brake1992 – 1996 2057
Dome Light1992 – 1996 561
Front Side Marker1992 – 1996 24
Front Turn Signal1992 – 1996 3057
License Plate1992 – 1996 24
Parking Light1992 – 1996 3057NA
Rear Side Marker1992 – 1996 194
Rear Turn Signal1992 – 1996 2057
Tail Light1992 – 1996 2057
Center High Mount Stop Light1992 – 1996 561
Courtesy1992 – 1996 194
Engine Compartment Light1992, 1995 – 1996 561
1993 – 1994 562
Glove Box1992 – 1996 194
Map Light1992 – 1996 192
Radio Display1992 – 1996 37
Rear Reading Light1992 – 1996 194
Trunk1992 – 1996 920