Hello

I have a 1979 Mercedes 300SD with 80k miles. Odometer works and service records from start to now. Only issues are RPM gauge works sporadically and dash lights are off (probably the dimmer)

A few questions:
1. What wheels are those?
2. Where could I find touch up paint or paint in that color?
3. The windows seem a bit "weak". Is there a solution for that?
4. How do the power locks function? With the key in the door?
5. What is the stock speakers and headunit for this car? (It has blankput headunit and speakers. The previous owner paid a shop to install it)
I noticed right away that the car's vacuum system has definitely be re-done and the mercedes benz specialty shop installed several one way vacuum valves (which is smart).
6. Where are common rust spots?