When doing replacement or upgrading on 1987 – 1991 GMC V1500 Suburban V2500 V3500 with 2 4 capsule halogen headlamps rectangular, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight1987 H4656
High Beam Headlight1987 H4651
Back Up Light1987 1156
Brake1987 2057
Dome Light1987 578
Front Side Marker1987 168
Front Turn Signal1987 2057
License Plate1987 67
Parking Light1987 2057NA
Rear Turn Signal1987 2057
Tail Light1987 2057
Luggage Compartment1987 1142
Engine Compartment Light1987 1156
Radio Display1987 1893
High Beam and Low Beam Headlight1987 H6054
Back Up Light1987 1156
Brake1987 2057
Dome Light1987 578
Front Side Marker1987 168
Front Turn Signal1987 2057
License Plate1987 67
Parking Light1987 2057NA
Rear Turn Signal1987 2057
Tail Light1987 2057
Luggage Compartment1987 1142
Engine Compartment Light1987 1156
Radio Display1987 1893
Low Beam Headlight1987 – 1988 H4656
1989 – 1991 H4703
High Beam Headlight1987 – 1988 H4651
1989 – 1991 H4701
Back Up Light1987 – 1991 1156
Brake1987 – 1991 2057
Dome Light1987 – 1991 578
Front Side Marker1987 – 1991 168
Front Turn Signal1987 – 1988 2057
1989 – 1991 3057NA
License Plate1987 – 1991 67
Parking Light1989 – 1991 194NA
1987 – 1988 2057NA
Rear Side Marker1987 – 1991 194
Rear Turn Signal1987 – 1991 2057
Tail Light1987 – 1991 2057
Luggage Compartment1987 – 1991 1142
Engine Compartment Light1987 – 1991 1156
Glove Box1989 – 1991 194
Map Light1989 – 1991 906
Radio Display1987 – 1991 1893
High Beam and Low Beam Headlight1987 – 1991 H6054
Back Up Light1987 – 1991 1156
Brake1987 – 1991 2057
Dome Light1987 – 1991 578
Front Side Marker1987 – 1991 168
Front Turn Signal1987 – 1988 2057
1989 – 1991 3057NA
License Plate1987 – 1991 67
Parking Light1989 – 1991 194NA
1987 – 1988 2057NA
Rear Side Marker1987 – 1991 194
Rear Turn Signal1987 – 1991 2057
Tail Light1987 – 1991 2057
Luggage Compartment1987 – 1991 1142
Engine Compartment Light1987 – 1991 1156
Glove Box1989 – 1991 194
Map Light1989 – 1991 906
Radio Display1987 – 1991 1893
Low Beam Headlight1987 H4656
High Beam Headlight1987 H4651
Back Up Light1987 1156
Brake1987 2057
Dome Light1987 578
Front Side Marker1987 168
Front Turn Signal1987 2057
License Plate1987 67
Parking Light1987 2057NA
Rear Turn Signal1987 2057
Tail Light1987 2057
Luggage Compartment1987 1142
Engine Compartment Light1987 1156
Radio Display1987 1893
High Beam and Low Beam Headlight1987 H6054
Back Up Light1987 1156
Brake1987 2057
Dome Light1987 578
Front Side Marker1987 168
Front Turn Signal1987 2057
License Plate1987 67
Parking Light1987 2057NA
Rear Turn Signal1987 2057
Tail Light1987 2057
Luggage Compartment1987 1142
Engine Compartment Light1987 1156
Radio Display1987 1893
Low Beam Headlight1987 – 1988 H4656
1989 – 1991 H4703
High Beam Headlight1987 – 1988 H4651
1989 – 1991 H4701
Back Up Light1987 – 1991 1156
Brake1987 – 1991 2057
Dome Light1987 – 1991 578
Front Side Marker1987 – 1991 168
Front Turn Signal1987 – 1988 2057
1989 – 1991 3057NA
License Plate1987 – 1991 67
Parking Light1989 – 1991 194NA
1987 – 1988 2057NA
Rear Side Marker1987 – 1991 194
Rear Turn Signal1987 – 1991 2057
Tail Light1987 – 1991 2057
Luggage Compartment1987 – 1991 1142
Engine Compartment Light1987 – 1991 1156
Glove Box1989 – 1991 194
Map Light1989 – 1991 906
Radio Display1987 – 1991 1893
High Beam and Low Beam Headlight1987 – 1991 H6054
Back Up Light1987 – 1991 1156
Brake1987 – 1991 2057
Dome Light1987 – 1991 578
Front Side Marker1987 – 1991 168
Front Turn Signal1987 – 1988 2057
1989 – 1991 3057NA
License Plate1987 – 1991 67
Parking Light1989 – 1991 194NA
1987 – 1988 2057NA
Rear Side Marker1987 – 1991 194
Rear Turn Signal1987 – 1991 2057
Tail Light1987 – 1991 2057
Luggage Compartment1987 – 1991 1142
Engine Compartment Light1987 – 1991 1156
Glove Box1989 – 1991 194
Map Light1989 – 1991 906
Radio Display1987 – 1991 1893
Low Beam Headlight1987 H4656
High Beam Headlight1987 H4651
Back Up Light1987 1156
Brake1987 2057
Dome Light1987 578
Front Side Marker1987 168
Front Turn Signal1987 2057
License Plate1987 67
Parking Light1987 2057NA
Rear Turn Signal1987 2057
Tail Light1987 2057
Luggage Compartment1987 1142
Engine Compartment Light1987 1156
Radio Display1987 1893
High Beam and Low Beam Headlight1987 H6054
Back Up Light1987 1156
Brake1987 2057
Dome Light1987 578
Front Side Marker1987 168
Front Turn Signal1987 2057
License Plate1987 67
Parking Light1987 2057NA
Rear Turn Signal1987 2057
Tail Light1987 2057
Luggage Compartment1987 1142
Engine Compartment Light1987 1156
Radio Display1987 1893
Low Beam Headlight1988 – 1991 9006
High Beam Headlight1988 – 1991 9005
Front Fog Light1988 – 1991 H3-55W
Back Up Light1988 – 1989 1156
1990 – 1991 3156
Brake1988 – 1989 2057
1990 – 1991 3057
Dome Light1988 – 1989 211-2
1990 – 1991 578
Front Side Marker1988 – 1991 194
Front Turn Signal1988 – 1991 2357NA
License Plate1988 – 1991 194
Parking Light1988 – 1991 2357
Rear Turn Signal1988 – 1989 2057
1990 – 1991 3057
Tail Light1988 – 1989 2057
1990 – 1991 3057
Courtesy1988 – 1991 1003
Engine Compartment Light1990 – 1991 1156
Glove Box1990 – 1991 194
Radio Display1988 – 1991 1893
Low Beam Headlight1988 – 1991 H4703
High Beam Headlight1988 – 1991 H4701
Front Fog Light1988 – 1991 H3-55W
Back Up Light1988 – 1989 1156
1990 – 1991 3156
Brake1988 – 1989 2057
1990 – 1991 3057
Dome Light1988 – 1989 211-2
1990 – 1991 578
Front Side Marker1988 – 1989 194
Front Turn Signal1988 – 1991 2357NA
License Plate1988 – 1991 194
Parking Light1988 – 1991 2357
Rear Turn Signal1988 – 1989 2057
1990 – 1991 3057
Tail Light1988 – 1989 2057
1990 – 1991 3057
Courtesy1988 – 1991 1003
Engine Compartment Light1990 – 1991 1156
Glove Box1990 – 1991 194
Radio Display1988 – 1991 1893
High Beam and Low Beam Headlight1988 – 1991 H6054
Front Fog Light1988 – 1991 H3-55W
Back Up Light1988 – 1989 1156
1990 – 1991 3156
Brake1988 – 1989 2057
1990 – 1991 3057
Dome Light1988 – 1991 211-2
Front Side Marker1988 – 1989 194
Front Turn Signal1988 – 1991 2357NA
License Plate1988 – 1991 194
Parking Light1988 – 1991 2357
Rear Turn Signal1988 – 1989 2057
1990 – 1991 3057
Tail Light1988 – 1989 2057
1990 – 1991 3057
Courtesy1988 – 1991 1003
Engine Compartment Light1990 – 1991 1156
Glove Box1990 – 1991 194
Radio Display1988 – 1991 1893