Climate & air duct parts for 1970 Coronet
 

Hi, My '70 Coronet (Factory A/C car) is missing a lot of its climate control, heater/air duct from under the dash. The switch plate also doesn't work at all.
The blower motor box's door isn't connected to anything, it's missing the hard-plastic weird-shaped ducts running across the bottom of the dash, and the windshield defrosters, or the (driver and pass.) side air louvers aren't connected to anything either.
I've never really messed or paid too much attention to climate control / air ducts parts, but they come in very confusing shapes and forms, and seem to be very different depending on the make and model. If I can visualize those parts, I could have an easier time finding them.

• Is there a business anywhere that make and sell reproductions?

• Is there a site on the web where I could find schematics / drawings / photos of how those ducts, hoses and switches pieces come together?

• Are there other make and model cars that share the same duct parts? I'm assuming a '70 RoadRunner or Charger, but I could be wrong. Would a 4-door '70 Coronet work?

Thanks for the help! :)