Compatible with models:

Vespa 50 (Special, R, L, N, 50 S 2°, PK, PK S, PK XL)
Vespa 90 / 90 SS
Vespa 125 (Primavera, ET3 1st type models from 1974 to 1978, PK, PK S, PK XL)
Ape 50 (models from 1974 to approx. 1978)