Ok,
here is what i'm talking about.
the first pic shows the raised bosses.
pic Then, there are two smaller holes with nothing in them. probably for two additional rivets since there doesn't seem to be anything holding the chrome trim to the assembly...
pic 2 it would seem that the seal would sit a little raised up unless the rivets get really flat.
pic 3 don't know cause they're on order so the job will have to wait on the mail...
