The alternator harness is described in the 67 Mustang electrical manual (Osborne).
If you don't have this, shot me a PM.
The alternator harness is available, but the end where it attaches to the solenoid post (or to the Shelby post) isn't up to snuff as far I can tell. But the wiring is identical even if I don't like the looks of the repop end.
As far as I recall the only wire rendered inop was the oil pressure idiot light, which is cut and then taped back into the small engine harness.