Compatible with models:

Vespa 50cc: Special, L, R, N, Elestart, PK 50, PK 50 XL, PK 50 Rush, PK 50 N
Vespa 125cc, 150cc, and 200cc: Primavera, ET3, PK 125, PK 125 XL
Vespa PX / PE: PX 125, PX 150, PX 200 (Arcobaleno, T5, Classic, and disc-brake versions)
Piaggio mopeds: Ciao, Si, Bravo, Boxer (used for the handlebar clamp or locking mechanism)