Amongst the seven pages in my copy of the VW 1500 Workshop Manual devoted to the many changes to the Solex 32 PHN carburetor is this:
My car would have originally been fitted with one of these plastic links, but it had the later version when I bought it. Since they were discontinued so early in production (May 1962) and were probably replaced in many cases during routine service it's not surprising that the plastic links are all but extinct, but Type 3 guru Jason Weigel, a.k.a. Notchboy, actually found one in his '62 1500. No doubt one of the few surviving examples on the planet.
[photo: Jason Weigel via The Samba]