Help ¡Axiom Isuzu 2004

Good morning. I have a problem with my truck. My mechanic replaced some valves, but he's currently stuck because he doesn't know how to reassemble the camshafts. He says he doesn't know how they're positioned/synchronized. I downloaded a manual from this same website and took it to him, but he says there's a difference because it's for a 2002 model. I would appreciate it if you could help me find the correct one for a 2004. My truck has been in the shop for a month now.