Stay away from Advanced Auto alternators...the remmaned ones specifically. My buddy has a Merc Mountaineer with 5.0 and with almost 200,000 miles on original alternator which operated fine, he asked me to put in a rebuilt alternator as preventative maintenance along with a new serp belt.

I've pulled the rebuilt alternator twice since then with 2 more rebuilt ones...not even a year yet and he's on rebuilt alternator #3.