It's under the boot, and can be a pain to replace.
And often if that is gone, it means water got into the boot area and probably did some damage to the rack as well. you can't tell for sure until you look under the boot.
Rebuilt rack assemblies are the common repair when inner joints are bad because of the involved PITA of replacing them combined with the likelihood of the rack having issues as well.
2 to 3 inches play is MAJOR, I'd avoid driving it more than needed to get it repaired, as mentioned above you still need to get a better look to see where the play is B4 guessing at the needed repair. Outers are needed a LOT more often than inners so don't plan on the major issue until confirmed.