Spark plug, supplied individually.

VW part number: 101-000-002/AB or 101-000-034/AA
Porsche part number: 999-170-156-90
Bosch equivalent: WR7DC+

To fit:
Volkswagen
Mk1 Golf - 1.1, 1.3 GF, GG, EM, FR, GS, FA, FH, 1.6 EN, and 1.5 JB, FN, up to chassis number 179 3750 000
Mk2 Golf - 1.3 MH, NU, HZ, NZ, GN, HK, GT, 1.6 EZ, HM, RH
Polo - 1.0, 1.3 HZ, MH, NZ, NU, 2G, AAK
T25 - to chassis number 24-K-175 000, 1.9 DG, SP, DF
T4 - 1.8 Petrol
Porsche
911 3.2 1984-1989 Engine M930.21, M930.25
924 S 2.5 1986-1988 Engine M44.07, M44.08, M40.40
928 4.7 1978-1991 Engine M28.11, M28.12, M28.21, M28.22, M28.43, M28.44, M28.45, M28.46
944 2.5-2.7 inc Turbo 1982-1991 Engine M44.05, M44.11, M44.12, M44.40, M44.52