VESPA VBA 150cc 1958

I have a Vesap VBA and need a new fuel tap but dont have a clue which one as there is so many.  Can anyone help me out??  

http://www.sip-scootershop.com/de/products/benzinhahn+fur+vespa+50125pv_15879300

 

the regular one should work.

Originally there is one with a glas.