Boy you guys sure are going through a lot. I bought the 280Z Hitachi alternator mentioned by number above. It was simple to attach. Then I needed a smaller alternator, so I bought the Hitachi RX7 one (sorry I don't have the number handy. I've posted it on here years ago. It's very close to the number above) It fit right onto the bracket with NO changes to anything.
This is on my SV with SV alternator mounting bracket.
To make the larger 280Z one fit, I just made to rectangular pieces about 3/4" x 2" with holes at each end. The alternator lined up perfectly when I bolted one of the pieces in front of both the alternator front mount and the mounting bracket front mount. On the rear, they were staggered and I had it like this: alternator back bracket, rectangular piece, mounting bracket back mount.
On the wiring (I got this straight from the 280Z wiring diagram), to make sure you get it right, the "L" goes to the light, the OTHER side of the light does NOT go to ground, but to keyed power. This is critical to make it work right. This charges the coils immediately, otherwise you'll need to blip the gas a bunch of times to get it charging. Then, of course, you eliminate ALL the light simulator and external VR.
The B goes to the battery side of the starter solenoid. The other wire, I forget what it's called, loops over to the B wire. That's it. That's exactly how the Z does it too.