Generation III Internal Engine - Intake and Exhaust seat part #

I need a set of stock intake and exhaust seats for a 2004 LS6 cylinder head. I've done some research, and haven't found any. I've also browsed a few websites with no luck. I can only find *similar* sized intake and exhaust seats. I prefer the factory.

Any help would be appreciated.
-Kyle

TTT, need this info!

TTT for the day...