Beginning at some point in 1970, K-members came with an identification coin. The identification coins are spot welded to the K-frame and have a two digit number on them which is the last two digits of the K-member part number.

For example, a 1971 E-Body K-frame is Chrysler part number #3583074. So the ID coin would be 74.

Notice in the image below that the K-frame ID'd "74", fits 70-71 E-Body 383/440 w/skid plate and 71 B and E-Body 318/340/383/440 w/skid plate.



The motor books will tell you that ALL 1966-to-1974 K-members will interchange. This is partly true as the K-members will bolt in, but the steering angle/pitch is what will bite you if you don't get the correct K-member for your application.