The most common type is the Ducati Performance one or one of the many copies available.
Genuine Ducati one is shown on my S4 below:-
The other type you will see is the S4 Challenge type which is a proper belly pan/oil catch used for the race bikes.
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Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers!
S4 Fogarty, S4R 07T, 748, Series 1 Mirage