When doing replacement or upgrading on 1965 – 1991 Ford LTD II Crown Victoria, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight 1979 4652
1980 – 1986 H4656
1965 – 1978 H5006
High Beam Headlight 1979 – 1986 H4651
1965 – 1978 H5001
Back Up Light 1965 – 1986 1156
Brake 1965 – 1986 1157
Dome Light 1965 – 1969 1003
1970 – 1971 105
1977 211-2
1972 – 1976, 1978 561
1979 89
1980 – 1986 912
Front Side Marker 1973 1157
1968, 1977 – 1979 1157NA
1971 161
1970, 1972, 1980 – 1985 194
1986 194NA
Front Turn Signal 1983 1156
1965 – 1982, 1984 – 1986 1157
License Plate 1965 – 1967 1155
1977 – 1982, 1984 – 1986 168
1975 – 1976, 1983 194
1973 – 1974 90
1968 – 1972 97
Parking Light 1965 – 1986 1157
Rear Side Marker 1977 – 1978 1157
1971 161
1969 – 1970, 1972 – 1976, 1979 – 1986 194
Rear Turn Signal 1983 1156
1965 – 1982, 1984 – 1986 1157
Tail Light 1965 – 1986 1157
Center High Mount Stop Light 1986 912
Courtesy 1980 161
1981 1892
1976 – 1977 211-2
1971 – 1972, 1974 – 1975, 1978 212-2
1965 – 1970 631
1973, 1982 89
1979 97
Engine Compartment Light 1965 1156
1966 – 1970 631
1973 – 1977, 1980 – 1986 89
Glove Box 1967 – 1970, 1972, 1983 – 1986 1816
1965 – 1966 1895
1973 – 1982 194
Map Light 1965 – 1966, 1974 – 1977 1003
1980 – 1986 105
1978 194
1979 561
1967 – 1970 631
Radio Display 1965 – 1967 1891
1979 1892
1968, 1972 – 1978, 1980 – 1986 1893
1969 – 1971 1895
Trunk 1965 – 1966 1156
1968 – 1971 631
1972 – 1986 89
1967 93
Low Beam Headlight 1987 – 1991 H4656
High Beam Headlight 1987 – 1991 H4651
Back Up Light 1987 – 1988 1156
1989 – 1991 3156
Brake 1987 – 1991 1157
Dome Light 1990 – 1991 561
1987 – 1989 912
Front Side Marker 1987 194
1988 – 1990 912
1991 916NA
Front Turn Signal 1987 1157
1988 – 1990 3157
1991 3157NA
License Plate 1987 168
1988 – 1991 194
Parking Light 1987 1157
1991 3157
1988 – 1990 912
Rear Side Marker 1987 – 1991 194
Rear Turn Signal 1987 – 1991 1157
Tail Light 1987 – 1991 1157
Center High Mount Stop Light 1987 – 1991 912
Courtesy 1988 – 1991 168
1987 89
Engine Compartment Light 1987 89
1989 906
1990 – 1991 912
Glove Box 1987 – 1991 194
Map Light 1987 – 1991 105
Radio Display 1987 1893
Trunk 1987 89
1989 906
1990 – 1991 912
Low Beam Headlight 1977 – 1979 H4656
High Beam Headlight 1977 – 1979 H4651
Back Up Light 1977 – 1979 1156
Brake 1977 – 1979 1157
Dome Light 1977 – 1979 211-2
Front Side Marker 1977 – 1978 194
1979 194NA
Front Turn Signal 1977 – 1979 1157
License Plate 1977 – 1979 168
Parking Light 1978 – 1979 1157
1977 1157NA
Rear Side Marker 1977 – 1979 1157
Rear Turn Signal 1977 1156
1978 – 1979 1157
Tail Light 1977 – 1979 1157
Courtesy 1979 161
1977 1816
1978 212-2
Engine Compartment Light 1977 – 1979 89
Glove Box 1977 – 1979 1816
Map Light 1977 – 1978 1003
1979 578
Radio Display 1977 – 1979 1893
Trunk 1977 – 1979 89