When doing replacement or upgrading on 1987 – 1991 GMC R1500 R2500 R3500 Suburban 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 Headlight 1987 H4656
High Beam Headlight 1987 H4651
Back Up Light 1987 1156
Brake 1987 2057
Dome Light 1987 578
Front Side Marker 1987 168
Front Turn Signal 1987 2057
License Plate 1987 67
Parking Light 1987 2057NA
Rear Turn Signal 1987 2057
Tail Light 1987 2057
Luggage Compartment 1987 1142
Engine Compartment Light 1987 1156
Radio Display 1987 1893
High Beam and Low Beam Headlight 1987 H6054
Back Up Light 1987 1156
Brake 1987 2057
Dome Light 1987 578
Front Side Marker 1987 168
Front Turn Signal 1987 2057
License Plate 1987 67
Parking Light 1987 2057NA
Rear Turn Signal 1987 2057
Tail Light 1987 2057
Luggage Compartment 1987 1142
Engine Compartment Light 1987 1156
Radio Display 1987 1893
Low Beam Headlight 1987 – 1988 H4656
1989 – 1991 H4703
High Beam Headlight 1987 – 1988 H4651
1989 – 1991 H4701
Back Up Light 1987 – 1991 1156
Brake 1987 – 1991 2057
Dome Light 1987 – 1991 578
Front Side Marker 1987 – 1991 168
Front Turn Signal 1987 – 1988 2057
1989 – 1991 3057NA
License Plate 1987 – 1991 67
Parking Light 1989 – 1991 194NA
1987 – 1988 2057NA
Rear Side Marker 1987 – 1991 194
Rear Turn Signal 1987 – 1991 2057
Tail Light 1987 – 1991 2057
Luggage Compartment 1987 – 1991 1142
Engine Compartment Light 1987 – 1991 1156
Glove Box 1989 – 1991 194
Map Light 1989 – 1991 906
Radio Display 1987 – 1991 1893
High Beam and Low Beam Headlight 1987 – 1991 H6054
Back Up Light 1987 – 1991 1156
Brake 1987 – 1991 2057
Dome Light 1987 – 1991 578
Front Side Marker 1987 – 1991 168
Front Turn Signal 1987 – 1988 2057
1989 – 1991 3057NA
License Plate 1987 – 1991 67
Parking Light 1989 – 1991 194NA
1987 – 1988 2057NA
Rear Side Marker 1987 – 1991 194
Rear Turn Signal 1987 – 1991 2057
Tail Light 1987 – 1991 2057
Luggage Compartment 1987 – 1991 1142
Engine Compartment Light 1987 – 1991 1156
Glove Box 1989 – 1991 194
Map Light 1989 – 1991 906
Radio Display 1987 – 1991 1893
Low Beam Headlight 1987 H4656
High Beam Headlight 1987 H4651
Back Up Light 1987 1156
Brake 1987 2057
Dome Light 1987 578
Front Side Marker 1987 168
Front Turn Signal 1987 2057
License Plate 1987 67
Parking Light 1987 2057NA
Rear Turn Signal 1987 2057
Tail Light 1987 2057
Luggage Compartment 1987 1142
Engine Compartment Light 1987 1156
Radio Display 1987 1893
High Beam and Low Beam Headlight 1987 H6054
Back Up Light 1987 1156
Brake 1987 2057
Dome Light 1987 578
Front Side Marker 1987 168
Front Turn Signal 1987 2057
License Plate 1987 67
Parking Light 1987 2057NA
Rear Turn Signal 1987 2057
Tail Light 1987 2057
Luggage Compartment 1987 1142
Engine Compartment Light 1987 1156
Radio Display 1987 1893
Low Beam Headlight 1988 – 1989 9006
High Beam Headlight 1988 – 1989 9005
Front Fog Light 1988 – 1989 H3-55W
Back Up Light 1988 – 1989 1156
Brake 1988 – 1989 2057
Dome Light 1988 – 1989 211-2
Front Side Marker 1988 – 1989 194
Front Turn Signal 1988 – 1989 2357NA
License Plate 1988 – 1989 194
Parking Light 1988 – 1989 2357
Rear Turn Signal 1988 – 1989 2057
Tail Light 1988 – 1989 2057
Courtesy 1988 – 1989 1003
Radio Display 1988 – 1989 1893
Low Beam Headlight 1988 – 1989 H4703
High Beam Headlight 1988 – 1989 H4701
Front Fog Light 1988 – 1989 H3-55W
Back Up Light 1988 – 1989 1156
Brake 1988 – 1989 2057
Dome Light 1988 – 1989 211-2
Front Side Marker 1988 – 1989 194
Front Turn Signal 1988 – 1989 2357NA
License Plate 1988 – 1989 194
Parking Light 1988 – 1989 2357
Rear Turn Signal 1988 – 1989 2057
Tail Light 1988 – 1989 2057
Courtesy 1988 – 1989 1003
Radio Display 1988 – 1989 1893
High Beam and Low Beam Headlight 1988 – 1989 H6054
Front Fog Light 1988 – 1989 H3-55W
Back Up Light 1988 – 1989 1156
Brake 1988 – 1989 2057
Dome Light 1988 – 1989 211-2
Front Side Marker 1988 – 1989 194
Front Turn Signal 1988 – 1989 2357NA
License Plate 1988 – 1989 194
Parking Light 1988 – 1989 2357
Rear Turn Signal 1988 – 1989 2057
Tail Light 1988 – 1989 2057
Courtesy 1988 – 1989 1003
Radio Display 1988 – 1989 1893
Low Beam Headlight 1987 – 1988 H4656
1989 – 1991 H4703
High Beam Headlight 1987 – 1988 H4651
1989 – 1991 H4701
Back Up Light 1987 – 1991 1156
Brake 1987 – 1991 2057
Dome Light 1987 – 1991 578
Front Side Marker 1987 – 1991 168
Front Turn Signal 1987 – 1988 2057
1989 – 1991 3057NA
License Plate 1987 – 1991 67
Parking Light 1989 – 1991 194NA
1987 – 1988 2057NA
Rear Side Marker 1987 – 1991 194
Rear Turn Signal 1987 – 1991 2057
Tail Light 1987 – 1991 2057
Luggage Compartment 1987 – 1991 1142
Engine Compartment Light 1987 – 1991 1156
Glove Box 1989 – 1991 194
Map Light 1989 – 1991 906
Radio Display 1987 – 1991 1893
High Beam and Low Beam Headlight 1987 – 1991 H6054
Back Up Light 1987 – 1991 1156
Brake 1987 – 1991 2057
Dome Light 1987 – 1991 578
Front Side Marker 1987 – 1991 168
Front Turn Signal 1987 – 1988 2057
1989 – 1991 3057NA
License Plate 1987 – 1991 67
Parking Light 1989 – 1991 194NA
1987 – 1988 2057NA
Rear Side Marker 1987 – 1991 194
Rear Turn Signal 1987 – 1991 2057
Tail Light 1987 – 1991 2057
Luggage Compartment 1987 – 1991 1142
Engine Compartment Light 1987 – 1991 1156
Glove Box 1989 – 1991 194
Map Light 1989 – 1991 906
Radio Display 1987 – 1991 1893
Low Beam Headlight 1987 H4656
High Beam Headlight 1987 H4651
Back Up Light 1987 1156
Brake 1987 2057
Dome Light 1987 578
Front Side Marker 1987 168
Front Turn Signal 1987 2057
License Plate 1987 67
Parking Light 1987 2057NA
Rear Turn Signal 1987 2057
Tail Light 1987 2057
Luggage Compartment 1987 1142
Engine Compartment Light 1987 1156
Radio Display 1987 1893
High Beam and Low Beam Headlight 1987 H6054
Back Up Light 1987 1156
Brake 1987 2057
Dome Light 1987 578
Front Side Marker 1987 168
Front Turn Signal 1987 2057
License Plate 1987 67
Parking Light 1987 2057NA
Rear Turn Signal 1987 2057
Tail Light 1987 2057
Luggage Compartment 1987 1142
Engine Compartment Light 1987 1156
Radio Display 1987 1893
Low Beam Headlight 1988 – 1991 9006
High Beam Headlight 1988 – 1991 9005
Front Fog Light 1988 – 1991 H3-55W
Back Up Light 1988 – 1989 1156
1990 – 1991 3156
Brake 1988 – 1989 2057
1990 – 1991 3057
Dome Light 1988 – 1989 211-2
1990 – 1991 578
Front Side Marker 1988 – 1991 194
Front Turn Signal 1988 – 1991 2357NA
License Plate 1988 – 1991 194
Parking Light 1988 – 1991 2357
Rear Turn Signal 1988 – 1989 2057
1990 – 1991 3057
Tail Light 1988 – 1989 2057
1990 – 1991 3057
Courtesy 1988 – 1991 1003
Engine Compartment Light 1990 – 1991 1156
Glove Box 1990 – 1991 194
Radio Display 1988 – 1991 1893
Low Beam Headlight 1988 – 1991 H4703
High Beam Headlight 1988 – 1991 H4701
Front Fog Light 1988 – 1991 H3-55W
Back Up Light 1988 – 1989 1156
1990 – 1991 3156
Brake 1988 – 1989 2057
1990 – 1991 3057
Dome Light 1988 – 1989 211-2
1990 – 1991 578
Front Side Marker 1988 – 1989 194
Front Turn Signal 1988 – 1991 2357NA
License Plate 1988 – 1991 194
Parking Light 1988 – 1991 2357
Rear Turn Signal 1988 – 1989 2057
1990 – 1991 3057
Tail Light 1988 – 1989 2057
1990 – 1991 3057
Courtesy 1988 – 1991 1003
Engine Compartment Light 1990 – 1991 1156
Glove Box 1990 – 1991 194
Radio Display 1988 – 1991 1893
High Beam and Low Beam Headlight 1988 – 1991 H6054
Front Fog Light 1988 – 1991 H3-55W
Back Up Light 1988 – 1989 1156
1990 – 1991 3156
Brake 1988 – 1989 2057
1990 – 1991 3057
Dome Light 1988 – 1991 211-2
Front Side Marker 1988 – 1989 194
Front Turn Signal 1988 – 1991 2357NA
License Plate 1988 – 1991 194
Parking Light 1988 – 1991 2357
Rear Turn Signal 1988 – 1989 2057
1990 – 1991 3057
Tail Light 1988 – 1989 2057
1990 – 1991 3057
Courtesy 1988 – 1991 1003
Engine Compartment Light 1990 – 1991 1156
Glove Box 1990 – 1991 194
Radio Display 1988 – 1991 1893