And FWIW, Rock Auto shows the 69-72 rotor (#7012) for $115. The rotor was always the expensive hangup for using factory 69-72 spindles, guys wanted the 73 spindles so they could use the $50 rotors. But guys always wanted more $$ for the 73 spindles, so overall it's almost a wash considering how much we spend on our cars overall.

The only difference between 69-72 and 73 is the bearings, seals and rotors. Other replacement parts are the same cost.