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 Headlight 1984 H4666
Back Up Light 1984 1156
Brake 1984 2057
Dome Light 1984 DE3175
Front Side Marker 1984 168
Front Turn Signal 1984 1156
License Plate 1984 67
Parking Light 1984 194
Rear Side Marker 1984 194
Rear Turn Signal 1984 1156
Tail Light 1984 2057
Trunk 1984 DE3175
High Beam and Low Beam Headlight 1984 – 1985 H4666
Back Up Light 1984 – 1985 1156
Brake 1984 – 1985 2057
Dome Light 1984 – 1985 DE3175
Front Side Marker 1984 – 1985 168
Front Turn Signal 1984 – 1985 1156
License Plate 1984 – 1985 67
Parking Light 1984 – 1985 194
Rear Side Marker 1984 – 1985 194
Rear Turn Signal 1984 – 1985 1156
Tail Light 1984 – 1985 2057
Trunk 1985 12818
1984 DE3175
High Beam and Low Beam Headlight 1985 H4666
Back Up Light 1985 1156
Brake 1985 2057
Dome Light 1985 DE3175
Front Side Marker 1985 168
Front Turn Signal 1985 1156
License Plate 1985 67
Parking Light 1985 194
Rear Side Marker 1985 194
Rear Turn Signal 1985 1156
Tail Light 1985 2057
Trunk 1985 12818
High Beam and Low Beam Headlight 1985 H4666
Back Up Light 1985 1156
Brake 1985 2057
Dome Light 1985 DE3175
Front Side Marker 1985 168
Front Turn Signal 1985 1156
License Plate 1985 67
Parking Light 1985 194
Rear Side Marker 1985 194
Rear Turn Signal 1985 1156
Tail Light 1985 2057
Trunk 1985 DE3175
Low Beam Headlight 1988 – 1991 9006
High Beam Headlight 1988 – 1991 9005
Back Up Light 1988 – 1991 1156
Brake 1988 – 1991 2057
Dome Light 1988 – 1991 DE3022
Front Side Marker 1988 – 1991 168
Front Turn Signal 1988 – 1989 1156
1990 – 1991 3497
Parking Light 1988 – 1991 194
Rear Side Marker 1988 – 1991 168
Rear Turn Signal 1988 – 1991 1156
Center High Mount Stop Light 1988 – 1991 921
Inner Tail Light 1988 – 1991 194
Outer Tail Light 1988 – 1991 2057
Trunk 1988 – 1991 DE3175