Large plate for the barrel = Pâlatre - N°1 on the photo
Each part can be purchased separately:
N°1 Pâlatre = Grande platine pour le fût 99*65mm
N°2 Petite plaque pour le couvercle 99*60mm
N°3 Coffre = partie bombée 30*58mm
N°4 Moraillon = partie trouée 48*65mm
or you can also buy all 4 parts in one item SERLMGORGE
The domed part N°3 is inserted in the part N°4, then is embedded in the part N°2 and will be hammered to fix at the back. The hasp (part 4 in the photo) is the part that joins the barrel
You can check out our blog post:
on the anatomy of a Louis Vuitton tumbler lock