When doing replacement or upgrading on 1975 – 1989 Volkswagen Scirocco, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight1982 – 1989 4652
1975 – 1981 H5006
High Beam Headlight1982 – 1989 H4651
1975 – 1981 H5001
Back Up Light1975 – 1989 1156
Brake1975 – 1989 1156
Dome Light1975 – 1989 578
Front Side Marker1982 – 1989 P21/5W
1975 – 1981 T4W
Front Turn Signal1975 – 1989 P21/5W
License Plate1975 – 1989 T4W
Parking Light1982 – 1989 1157
1975 – 1981 P21/5W
Rear Side Marker1975, 1977 – 1978, 1980 – 1982, 1985, 1987 12929
1976, 1979, 1983 – 1984, 1986, 1988 – 1989 T4W
Rear Turn Signal1975 – 1989 1156
Tail Light1982 – 1989 12814
1975 – 1981 12821
Center High Mount Stop Light1985 – 1989 194
Glove Box1979 12818
1975 – 1978, 1980 – 1981 DE3175
Trunk1975 – 1981 DE3423