From 67 up there is only one center link used on both \6 and V8 cars. BUT, there is a difference in the 67-72 and the 73-76 center links. Either one can be used but the same year range pitman and idler arm as the center link need to be used as a set.
The difference is how the post on the pitam and idler go through the center link. Can't recall which is which but one range goes through the center link from the bottom with the nut on top and the other is opposite.