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 Headlight1988 – 1991 H6054
Front Fog Light1991 881
1988 – 1989 889
Back Up Light1988 – 1991 890
Brake1988 – 1991 2057
Dome Light1991 192
1988 – 1990 561
Front Side Marker1988 – 1991 194NA
Front Turn Signal1988 – 1991 890
License Plate1988 – 1991 194
Parking Light1988 – 1989, 1991 194NA
1990 2057NA
Rear Side Marker1988 – 1991 194
Rear Turn Signal1988 – 1991 2057
Tail Light1988 – 1991 2057
Center High Mount Stop Light1988 – 1989 1156
1990 – 1991 891
Courtesy1988 – 1991 168
Engine Compartment Light1988 – 1991 89
Glove Box1991 194
Map Light1988 – 1990 192
1991 561
Trunk1988 – 1991 1003