got both bearings for my roundback at NAPA...as well as one + diode...free rental pully puller came from autozone...think they had it listed as a P/S puller...upper hose Gates from NAPA, lower Continental from Autozone...both halves of the alternator have casting dates on them(on little clockfaces), many rebuilds wind up with 2 different year pieces or have been blasted so much they dates are worn away...so matched halves with the right dates are important to the crazy people with the big bucks cars and are valuable cores to some people so i wouldnt necessarily hand in one of those those for a mis matched Duralast