The worse bit was the fuel cap.
The ugly red plastic one I've used before just because it was so ugly now turned from funny ugly to a disgrace.
So I took a deep breath and bought the expensive but so classic and beautiful 2,5" Monza fuel cap and a threaded aluminum filler neck.
The Monza cap and filler neck together and the neck is way to long.
Up in the lathe to shorten it and enlarge the inside to fit over OEM Zündapp filler neck.
Nice fit, just to thread on the Monza fuelcap.
Mounted and open.
Mounted and closed