Quote:

I want to put the mirrors on a 1970 Plymouth Duster- They both have the short 1 screw bases.




Sounds like you are ready to go. Now the decision will come where to mount the passenger mirror. In the factory location OR test it and move it to where you can see best out of it with your seating location. Should be easier to see out of the passenger mirror on a Duster since it doesn't have a vent window bar to block it.