Spark plug, sold each.

VW numbers 101-000-040/AD, 101-000-036/AA, 101-000-050/AC

Bosch spark plug code
W - 14mm x 1.25mm
R - Suppressed
7 - Heat range
L - 19mm Reach
T - Tripple electrode
C - Copper electrode

Engine fitments
Corrado 2.0 ADY, 2E
Mk3 Golf ABS, ABU, 2E, ADY, AEP, ADZ, ADZ, AEA
Brazilian Kombi 1600 Injection
Mk2 Golf 1.3 HZ, NZ, 2G, 1.8 GU, RH, PB, PF, RV, EV, GZ, HV,