RMS Vespa Throttle Cable Pulley PX, T5, PK
The Throttle Pulley connects with the throttle cable in the headset. This then operates with the arm inside of the airbox. Your arm will either just operate the Carburettor (non-autolube) or Carburettor (autolube) which fits on the Oil pump arm. It's good to check this part, because it may effect the operation of the throttle.
This is an aftermarket part by RMS.
Comparison No. 139797 (PIAGGIO)