Centerlink for 74 Duster

I have two of these for an a body not real sure exactly what they fit difference between manual and power steering? real cheap basically cost to ship from zip 46567
Not sure what difference is. I have one from a 72 6cyl duster and the holes for pitman arm and idler arms are smaller and overall length is longer. I ordered all steering parts for a 74 318 duster. I'm thinking 73 & up is different.