I just bought a 1970 1600 Sport and love it. Ok, more than love it.

I think the two side mirrors on mine were replaced (see pictures below). They don’t look quite right and they feel too lightweight to be an original part. I searched online and I’m definitely finding pictures of 1970 1600s with different mirrors and quite a few with only one on the driver’s side. So some questions come to mind, all probably with painfully obvious answers to all of you.
1. Where can I get a catalog or owner’s manual for the 1970 so I can figure stuff like this out?
2. Am I right that I have replacement mirrors?
3. How rare are original side mirrors?
4. How many originally came on the car?
5. Can anyone suggest a place to get them or do I just watch for a 70 being parted out?
I apologize if this topic is not in the right forum or has been asked before. I searched but didn’t see.
FlowerGirl