mopa

Hi guys,

I am not sure what the name of part that is damaged. I had a new belt
installed on my A/C compressor, and the guy said that I needed to get
my left wheel fixed.

The rubber is broken off as you can see in the picture, but what I am
trying to do is figure out the name of the part that I need to buy, and
get replaced. I am not sure if this is something I can do, as I bet you
need special tools, and I don't want to mess something up.

What does it look like is appeared to be wrong? and if so would you
know how much it should cost me? the guy said it will cost about $200 +
parts.

I rather buy the parts, because I know it will be cheaper than if I get
them off them, as they always jack up the prices.

Thanks

http://mopa.net/fotos/left-wheel-joint.jpg