Shifter Linkage Rod difference 64-66/67-72???

which linkage rod? the actual adjustable rod for the clutch? the 63-66 are completely different linkage and fork. also if you are going to a newer 10.5 clutch and bellhousing you will need completely different linkage. Go to Brewers and look at the linkage page there you will see they have it pretty well laid out as for linkage that works for the "10.5 upgrade" and all you will need.