What parts do we need to buy from rockauto. This is my 17yr old daughter's jeep. This happened today when she was backing out of the driveway. I don't know anything about cars and need some help.
The part that broke is the lower ball joint. From the pictures everything else looks pretty intact - I would maybe be worried about the CV Shaft (the part with boots that is pulled out) since it was pulled out by the end, I don't think they like that very much. Since the front differential lost some fluid, it would be a good time to drain the rest out and refill it as well.
Lower ball joint and differential fluid would be the bare minimum essentials I think.
As far as what else to check, I'll defer to some of the more experienced techs on here that spend way more time working on these than myself with a year and a half of ownership.
Hope that at least gets you started in the right direction!