I am trying to add a picture of what it should look like for us to reference. I found this picture...is this how it should look? If so, this might be my vibration sound I am hearing as it appears half of the crank pulley is missing this gasket/rubber fill...maybe out of balance. Nothing is protruding, just all of it does not appear to be there. Will find out for sure when I install my new alternator if the sound goes away.