I asked for a 1993 Mustang alternator, 5.0. It came out to a 130 amp. I am having issues with mounting it on a serpentine setup, so check out that thread first unless you are just swapping it out on the stock setup. http://mmb.maverick.to/showthread.php?t=66395 O'Reilly part number was Ultima 01-0205
they cost way to much at the store you are beter off buying a 100 amp one wire alternator or you can go to the local pick-n-pull and buy one there for $25 bucks and take it to kragen/autozone and have it tested to see if it works if not then you can take it back and get another one http://mmb.maverick.to/showthread.php?t=57464
I got mine almost brand new at the junkyard for $10. It was an Autozone motorcraft piece. It still has the sticker with the part number which is: 7761-5-7 i checked the price and its $135.99 w/core swap. So yeah either try getting one off of ebay, or the 100amp one.