2007 Pontiac wave 4 door sedan

I had a mechanic tell me that I needed my lower and upper ball joints fixed however all other mechanics told me there was no such thing as an upper ball joint for my vehicle. So my question is what is located directly above my lower ball joint in the front end of my vehicle? Whatever it is, that is what’s needing to be fixed as well but I can’t get it fixed until I know what it is!