Okay, I'm not seeing how to open up that housing. Guess I should pull the Pulley off first to get a good look. Still confused though on what to buy. My local Autozone has this - http://www.autozone.com/?loggingIn=true&_requestid=1694408 Would I have to pull the actual pump out that housing and put it in mine? or does that whole pump go into my housing. Sorry, just started this process, I'm sure it will all clear up soon.