i had this same issue with my red vp, wish i had taken pics for you. the driver side door trim had been removed and refit too many times because a window motor issue. several of the plastic circular mounts had ripped off the inside of the door card and were missing, and some just became brittle and broke into pieces.
what i did was go to the wreckers and pry off a bunch of circular mounts with a flathead screwdriver from various VS commodore door cards laying on the ground or ones people destroyed removing.
buy a small tube of black urethane adhesive, rough up the donor mount around the bare plastic edges with an abrasive of any kind. then reapply the them with a dob of urethane and wipe your finger right around the edge, even let urethane smear over the top of the mount. let dry for 24 to 48 hours, refit your door trim...
ive done a dozen or more of these fixes and not one of the mounts ever ripped off when i removed the door trim again. you can get a 100ml tube of this sikaflex stuff at bunnings or autobarn. which should be heaps...
edit: sikaflex is solvent based so cleanup is with a multi purpose paint thinner of any kind...