I like John Gillard’s choice of “flitch” which in dialect (East Anglian I think) is a side of bacon. appropriately mounted on the jambonneau (ham).
(See Dunmow Flitch).
The UK parts list calls it the “wing valance” and the French parts list refers to it is “joue d’aile” – the wing cheek.
When fitting the sealing strip on the bulkhead, it won’t do any harm to put a bit of sealant on the screw holes.
Roger Grix