Hi Etienne,
The Drawings and Parts Description on the World of Triumph web site aren't very clear,
and the descriptions don't match up with the information on their site for the Right Hand side fairing !
As far as I can tell, from comparing both sides of the Fairing on the World of Triumph Web site :
PFKL2307396 COOLING DUCT FINISHER,LH,GRAPH is the Part you need.
This is the outermost part of the complete assembly.
( i.e. the part that would get scratched if you dropped the bike ).
PFKL2321208 "VENT COVER" I think should actually be named "Kit, Finisher, LH"
( like it is described on the W.O.T site for the RH Fairing Part ).
The "Kit" probably includes the Finisher ( PFKL2307396 )
and the fixing screws !
Hope that helps !