Spacer cylinder base -BGM ORIGINAL Polini 133 cc- Vespa V50, PV125, ET3, PK50, PK80, PK125 - 5.0mm 51268

Cylinder base gasket -BGM PRO- 5,0mm Polini 133ccm (aluminium)Cylinder base gasket -BGM PRO- 5,0mm Polini 133ccm (aluminium)

The 133 is turned and raised accordingly. At the same time you get bigger overflow valves and more comfortable timing.

Here is the distance for your own conversion, which in the kit WS5002 is even already machined.
_{AI-translation}