Yup, pretty much the 71-73 suspension is totally different than the 74 and up. Not much will interchange. Pretty much the only difference between the 71-73 suspension is the steering rack for the 73. As mentioned above, it is a one year only rack. The 73 rack is bigger and bulkyier than the 71-72 ones. I'm not sure why they changed them? My 73 hatch has a 72 rack in it now for clearance for the 2.3T. As I understand it from my friend who did the conversion, he cut and rewelded in the 72 mounting brackets to the 73 and along with the rag joint, bolted it right in.