CNC fuel tank cap searched

[Laverdatriple]

Hello,

My Name is Peter, 54 years old and I living in Germany near the dutch border.
I own a Skorpion Sport.

I'm working on my SOS Skorpion for the track.
My main work is to save weight.
For that I want to change the fuel tank cap into a billet aluminium race cap.
But nothing for the MZ on the market.

Does anyone knows with which Bike the MZ shares the cap?
I can't believe that it's a one which only MZ use.
Does anyone knows a milled aluminium Tank cap which fits to die Skorpion fuel tank?

Please help!

Thank
Peter