I think the part 928 537 417 02 Bracket and 928 537 425 02 for the plastic base. It will need some work to install as it pulled through. You can either live with it without the door check. To fix it I think it will require some welding work but with the interior right next to it someone will have to be careful.
Congrats!!! You got a nice car. As for your questions:
1, there is discolouration in the darker leather along the top of the door panels. It doesn't clean off so I'll need to fully clean and re-dye. Do you know the colour name/number? It is classic gray. The color suffers from the sun. You will need to paint/re-dye it. There should be some other non-faded examples around the interior. The screw caps on the door panels as i recall. Take one of those off and have it color-matched. They do a nice job these days with a good sample.
2., There are rattles in the top (passenger side)...any tricks to remove the liner and tighten frame? No, not that I know of. I would take it to someone who knows these tops and have them take a look.
3. During the pre-purchase inspection, the Porsche dealer measured the paint thickness and said the passenger door had been re-sprayed...any knowledge of that? yes, I had the passenger side resprayed. Nothing but door dings. They did a nice job with the color match.
4, and finally...the driver's side door hinge damper (if that's what it's called) is missing so the door swings freely...do you know what this part is called? That was broken when i sold the car and i gave the new part to Steve. It is the door swing stop. I can get you the part number if needed.
Don't forget to join the Porsche club and the 968 register and enjoy the car. We have a few 968ers in Canada.
I owned the car for 11 years purchasing it in 1996 and selling it 2007. The car now has 56K miles on it. The owner is Steve and his number is 908-812-8795. It is a great car, fully maintained. Tell Steve that Jeff sent you.