I took the plunge and ended up ordering an alt from eBay for the final price of $114.

http://www.ebay.com/itm/like/271021212922

 I live around the Chico area, and the alt shipped from Newcastle. It only took a day, which to me was awesome. I came home tonight to it sitting on my doorstep. Later I pulled the old unit from my 4Runner and compared them.

The new one is obviously bigger but not by much. The pulleys on the old and new units are not much different in OD size. So I decided to just temporarily swap my v pulley in the place of the serpentine pulley.

That is where I ran into my first problem. The bore of the v pulley is roughly 14.9 mm and the serp pulley is roughly 16.9mm. I may just drill the v pulley out, but I think there is a very slight taper in both. I have not confirmed this yet.

I moved on to see how well the new alt fit into the puny underpowered 60A alternators spot. Problem #2 showed up. There is a slightly raised area in the casting, just behind the front ear on the base mount. This was solved by removing the mount bracket, and quickly taking it down with a good ol file.

With that done the alternator was dropped into its soon to be permanent home. With the base bolt ran through, I swung it over to check its adjustment travel. It just barely made it to the slotted bracket before hitting the coolant hose coming from the timing cover, and the alt case on the lower bracket.

This explains why the top threaded tab on the original alternator is at about the 11 o clock position. It tilts the case away from the base mount. This weekend I'll hit up the junk yard to try and find an alternate bolt in tension bracket. If that doesn't work, I'll just build my own, or extend an extra I have somewhere.