When doing replacement or upgrading on 1988 – 1991 Buick Reatta, 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 1988 – 1991 H6054
Front Fog Light 1991 881
1988 – 1989 889
Back Up Light 1988 – 1991 890
Brake 1988 – 1991 2057
Dome Light 1991 192
1988 – 1990 561
Front Side Marker 1988 – 1991 194NA
Front Turn Signal 1988 – 1991 890
License Plate 1988 – 1991 194
Parking Light 1988 – 1989, 1991 194NA
1990 2057NA
Rear Side Marker 1988 – 1991 194
Rear Turn Signal 1988 – 1991 2057
Tail Light 1988 – 1991 2057
Center High Mount Stop Light 1988 – 1989 1156
1990 – 1991 891
Courtesy 1988 – 1991 168
Engine Compartment Light 1988 – 1991 89
Glove Box 1991 194
Map Light 1988 – 1990 192
1991 561
Trunk 1988 – 1991 1003