Today I got an idea and checked the beetle Solexes for the same bolt as I had a thought they might be the same as I had read somewhere that Zenith carbs use some same parts as Solexes. Well, even the venturis in these Zeniths says Solex... :)

Anyways the bolts were identical so I took 3 bolts from a scrap Solex to replace the ones I've managed to loose during the 3 years I've restored this first one...