When doing replacement or upgrading on 1965 – 1976 Cadillac Calais, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight1975 – 1976 H4656
1965 – 1974 H5006
High Beam Headlight1975 – 1976 H4651
1965 – 1974 H5001
Back Up Light1965 – 1976 1156
Brake1965 – 1976 1157
Dome Light1975 1004
1971 161
1965 – 1970, 1976 212-2
1972 – 1973 90
Front Side Marker1974 – 1976 194NA
Front Turn Signal1965 – 1976 1157
License Plate1973 194
1965 – 1970 67
1971 – 1972, 1974 – 1976 97
Parking Light1967 – 1976 1157
1965 – 1966 1157NA
Rear Side Marker1972 – 1973 168
1968 1895
1969 – 1971, 1974 – 1976 194
Rear Turn Signal1965 – 1976 1157
Tail Light1965 – 1976 1157
Courtesy1971 168
1965 – 1970, 1972 – 1976 90
Engine Compartment Light1973 – 1976 1003
1965 – 1970, 1972 89
Glove Box1971 1445
1970, 1972 – 1976 1816
1965 – 1969 1895
Map Light1974 – 1976 562
1967 – 1971 89
1965 – 1966 90
Radio Display1967 – 1971 1816
1965 – 1966, 1972 – 1974 1895
Trunk1973 – 1976 1003
1971 168
1965 – 1970, 1972 89