When doing replacement or upgrading on 1984 – 1991 Honda Civic CRX CRX 1.5 HF Si, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

High Beam and Low Beam Headlight1984 H4666
Back Up Light1984 1156
Brake1984 2057
Dome Light1984 DE3175
Front Side Marker1984 168
Front Turn Signal1984 1156
License Plate1984 67
Parking Light1984 194
Rear Side Marker1984 194
Rear Turn Signal1984 1156
Tail Light1984 2057
Trunk1984 DE3175
High Beam and Low Beam Headlight1984 – 1985 H4666
Back Up Light1984 – 1985 1156
Brake1984 – 1985 2057
Dome Light1984 – 1985 DE3175
Front Side Marker1984 – 1985 168
Front Turn Signal1984 – 1985 1156
License Plate1984 – 1985 67
Parking Light1984 – 1985 194
Rear Side Marker1984 – 1985 194
Rear Turn Signal1984 – 1985 1156
Tail Light1984 – 1985 2057
Trunk1985 12818
1984 DE3175
High Beam and Low Beam Headlight1985 H4666
Back Up Light1985 1156
Brake1985 2057
Dome Light1985 DE3175
Front Side Marker1985 168
Front Turn Signal1985 1156
License Plate1985 67
Parking Light1985 194
Rear Side Marker1985 194
Rear Turn Signal1985 1156
Tail Light1985 2057
Trunk1985 12818
High Beam and Low Beam Headlight1985 H4666
Back Up Light1985 1156
Brake1985 2057
Dome Light1985 DE3175
Front Side Marker1985 168
Front Turn Signal1985 1156
License Plate1985 67
Parking Light1985 194
Rear Side Marker1985 194
Rear Turn Signal1985 1156
Tail Light1985 2057
Trunk1985 DE3175
Low Beam Headlight1988 – 1991 9006
High Beam Headlight1988 – 1991 9005
Back Up Light1988 – 1991 1156
Brake1988 – 1991 2057
Dome Light1988 – 1991 DE3022
Front Side Marker1988 – 1991 168
Front Turn Signal1988 – 1989 1156
1990 – 1991 3497
Parking Light1988 – 1991 194
Rear Side Marker1988 – 1991 168
Rear Turn Signal1988 – 1991 1156
Center High Mount Stop Light1988 – 1991 921
Inner Tail Light1988 – 1991 194
Outer Tail Light1988 – 1991 2057
Trunk1988 – 1991 DE3175