Many years ago when I was ordering direct from Italy they called that part the"dust cover"
Ed
In 1986, Henk and I did the 'grand tour', flying both the Salzburg (Austria) and St. Etienne (France) contest, leaving us one week in between.
Spend that time going into N-Italy and visiting the Pianoro (n. Bologna) ST factory.
We managed to get sufficient parts supply to keep our ST .60 and G21/46 engines running.
Meanwhile we've used up most of it, 't was a good investment.
But since 10 years I've moved up to electric.
I only fly IC for nostalgic reasons every now and then.