Correct kickdown linkage for a '74 Duster?

Yup.^^^ And there is nothing more solid than the information published by Chrysler Corp at the time.
Is it perfect? Well no. Sometimes they kept old illustration or made mistakes, but for things like this - its going to be pretty up to date.
You can then check Hamtramck Historical Library for technical service bulletins. Not sure how much for '74 has been collected, scanned and added but always worth a check.