1998 Chevy Tracker I need an Exhaust Manifold PLEASE HELP

I have been looking every where and I can not locate a 1998 Chevy Tracker Exhaust Manifold. I did last week for $65.00, but had to return because it had small crack on it, so I am back to square one. My question; can I use a 1997, 99, 2000 or 2001 exhaust manifold?
Also, my check engine light is on because of an EGR problem. My mechanic tested the EGR and says nothing is wrong. He thinks if I fix the cracked exhaust manifold this should solve the problem. Something about back pressure. Thank you very much. Oh yah, any idea where I can find a good deal on an exhaust manifold?
thanks again!