'79 wagon lower trim fix

yesterday the lower trim (rubber 'n chrome) strip fell off my driver's side door. the front end of the trim piece seems to have a little clip that is rusty but intact, but the rear end of the trim piece just has a rusty hole on its back side. i popped the little cover off the rear bottom of the passenger side door to see what it *should* look like and there is a little nut that seems to connect to a small threaded pin that is attached to the trim piece. obviously, that threaded pin has rusted away from my passenger-side trim piece. do you sell a replacement part for this, or do i need to A) buy a new (or used) whole piece of trim or B) jerry-rig something?

the bottoms of my doors behind the trim were alarmingly wet and starting to rust (or more than starting, in some cases). is there typically a drainage problem that is correctable?

Thanks!

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