I just purchased my first new bimmer (97 318) is all good except for that the previous owner completely ghettofied it

. There are some trims parts that I would like to get new if possible:
rubbers pads for underbody(protects the body when you jack the car under the body)
Rear License Plate screw mounts (there are 2 mounts that are gone, these are the plastic ones you screw in the screws.)
Rear window outside trim (need to buy a new window, so I will need that trim)
I have checked out a few catalogues, but they don't have these parts, could anybody know of a dealer, catalogue, junker, etc where I could get this parts?