When doing replacement or upgrading on 1987 - 1993 Volkswagen Fox, the bulb size guide is necessary for you to take the reference.  
High Beam and Low Beam Headlight 1992 - 1993 9004
1987 - 1991 H6054
Back Up Light 1987 - 1993 1156
Brake 1987 - 1993 1156
Dome Light 1987 - 1991 578
1992 - 1993 DE3423
Front Side Marker 1987 - 1993 12256
Front Turn Signal 1992 - 1993 1157
1987 - 1991 P21/5W
License Plate 1987 - 1993 T4W
Parking Light 1987 - 1993 1157
Rear Side Marker 1987 - 1993 12256
Rear Turn Signal 1987 - 1993 1156
Tail Light 1987 - 1993 12814
Center High Mount Stop Light 1987 - 1993 194
Map Light 1987 - 1993 12844

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