When doing replacement or upgrading on 1963 – 1999 Buick Riviera, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight1988 – 1993, 1995 – 1999 9006
1975 – 1985 H4656
1986 – 1987 H4703
1963 – 1974 H5006
High Beam Headlight1988 – 1993, 1995 – 1999 9005
1975 – 1985 H4651
1986 – 1987 H4701
1963 – 1974 H5001
Back Up Light1963 – 1993 1156
1995 – 1999 3057
Brake1963 – 1985 1157
1986 – 1993 2057
1995 – 1999 3057
Dome Light1963 – 1969 1004
1971, 1996 – 1999 194
1970, 1973 211-2
1972 212-2
1974 – 1984 561
1985 – 1993 562
1995 912
Front Side Marker1972 – 1973, 1983 – 1988, 1992 – 1993, 1995 – 1999 194
1968 – 1970, 1977 – 1982, 1989 – 1991 194NA
1971 97
Front Turn Signal1963 – 1985 1157
1986 – 1993 2057
1995, 1997 – 1999 3057
1996 3157NA
License Plate1963 – 1964 1155
1977 168
1973 – 1976, 1978 – 1993, 1995 – 1999 194
1965 – 1972 97
Parking Light1963 – 1980, 1982 – 1985 1157
1981 194NA
1986 – 1993 2057NA
1997 – 1999 3057
1995 3057NA
1996 3157
Rear Side Marker1971 1157
1977 168
1968 – 1970, 1972 – 1976, 1978 – 1989, 1991, 1993, 1995 – 1999 194
1990, 1992 24
Rear Turn Signal1964 1034
1963, 1965 – 1985 1157
1986 – 1993 2057
1995 – 1999 3057
Tail Light1963 – 1964 1034
1965 – 1976, 1978 – 1985 1157
1977 168
1989, 1993 194
1986 – 1988, 1990 – 1992 2057
1995 – 1999 3057
Center High Mount Stop Light1987 – 1988 1141
1986, 1989 – 1993, 1995 – 1999 1156
Courtesy1979 – 1980, 1983 – 1985, 1989 – 1993, 1995 – 1999 168
1971 194
1969 211-2
1975 – 1978, 1981 – 1982, 1986 562
1970 89
1963 – 1968, 1972 – 1974 90
1987 – 1988 912
Engine Compartment Light1963 – 1969, 1972 – 1973, 1976 – 1980, 1982 1004
1995 – 1999 561
1970, 1983 – 1993 89
Glove Box1981 – 1982 1891
1963 – 1970, 1972 – 1978 1893
1979 – 1980, 1985 – 1986, 1992 – 1993, 1995 – 1999 194
Map Light1982 – 1983, 1985 – 1988 1004
1997 – 1999 168
1971 194
1980 211-2
1974 561
1990 – 1993 562
1972 – 1973, 1975 – 1977, 1979, 1981 578
1963 – 1967 89
1995 – 1996 906
1984 912
Radio Display1974 1816
1965 – 1969 1892
1970, 1972 – 1973, 1975 – 1978, 1982 1893
1979 – 1980, 1983 – 1988 194
Trunk1983 – 1993 1003
1995 – 1996 1156
1971 194
1997 – 1999 211-2
1963 – 1970, 1972 – 1982 89