Interior help with lost part.

Those forward glass guides are available in a kit for 1 or both doors. Average cost is 50 USD per door.
As for that special oval shaped screw catcher you need in the quarter, I seriously doubt its available. I have a broke one laying on my tool box. Owners of donors might break what the have at removal. Worse is your breaking what they provide at your install. Plastics get brittle with age. Nature of the beast.