If all else fails, all of those parts should be available reproduction through someplace like NPD. I don't think the 8.8 was used until the late 70's to early 80's, the 8" and 9" were around in the 60's, both the Falcon and the mustang used 8" rears in the 6cyl cars and some smaller v8 cars like the mustang and Falcon. As you probably know, most parts from a Falcon fit a mustang of the same year and vice versa so, I'm pretty shure that if you found a '64-'66 ( maby other years ) 5 lug Falcon, the spindles will interchange with your mustang, The Falcon V8 Radiator might be the same also and, the axles would be the same. As you probably know, the original Ford Mustang's were based on the Falcon Chassie, most all the suspension/ drivetrain components are the same and interchagable.