K-Member for engine swap

72 you are close. There are actually six different k-members from 67-72, two of each that you mentioned. 67 had a unique idler arm, but the rest of the k-member is the same. There were two 73-76 k-members, V8 and /6, both with spool mounts. The spool mount V8 k-member is the one that Chrysler modified into the Direct Connection k-member in the mid-70s.

All early a-bodies (66-earlier) used the same k-member AND rubber mounts. The engine brackets were different between a 273 and /6.