I found and installed a brand-new "Pierburg" on my 320/6. It looks almost exactly like the Solex, bolts right on and works a WHOLE lot better. I have no idea what it was designed for. One interesting feature is the use of solenoid controlled fast idle/cold enrichment needles next to the idle mixture screws. It took me along time to figure out you start one of these things cold just like it has F.I.; do NOT step on the gas!...DUHHH..!