OK you need to check this out very carefully. What you just said makes no sense. It is common on disk brake cars to reverse the spindles side to side, which puts the brake calipers on the rear of the spindles instead of the front. If you are talking about the pointed ends (tapered studs) where 4 fittings go through the center link---THAT SETUP CHANGED in 73. 67--72 drag link is DIFFERENT than 73 and later, and the idler arm and pitman arm are also different. You can interchange them AS A GROUP. But they all must "group" in the same years range