Locking for my seat

Hello. My seat does not keylocks, just has a little spring on an arm which locks the seat on a cone.

Is there any keylock i can put on my seat, or do i have to change the whole seat in order to lock with key?

Thank you

hi dude ..


wich seat do you got  item code ??

and what vespa do you got ??

i am not sure but this is the pin:


if have a v50s (V5SA1T i think, 1979, but assembed in a greek factory so they maybe customized some parts e.g. the seat)

did you resolved with the pin ?