rocker arm

Hey guys, I have a question about my 09 Charger 3.5L V6. I had a very loud ticking noise and just got my engine repaired today at the dealership. On my paperwork it says they replaced Rocker shafts and used these parts: (2) 4892293AC Arm - Inlet and exhaust valve (2) 4892146AA - Gasket -...

I have that infamouse failed rocker arms on my 20,000 3.5l charger. I do not know if anyone even maker aftermarket rockers for this engine or where to get them. Any help would be nice. I really do not want to use mopar junk and have the same issues. I am not covered under factory warranty so...