I ordered the genuine one today reason being it is a complete sill panel that goes all the way from under the door hinge to join at the back so it has the recess and all behind the froint mudguard (where the rust is )any other rust Ill be cutting out and rewelding the unrusted parts from the old sill. Rare spares are pretty $$$
It pays to shop around I was pricing some brake rotors this week. My normal suplier who usually looks after me quoted $350 each!!! I got them for $248 in the dba 4000 series sloted.
Andrew