I'm running the ATI Damper .. It pushed my bottom pulley out by 3/8" (0.375"). How do I know this? When I saw that my alignment was screwed up, I bolted on the AR Engineering motor plate which happens to be 3/8" thick and to my surprise, the water pump and crank pulleys came back into alignment! As far as the alternator goes, I just make spacers on the lathe to get that lined up. I can provide pictures if you like.