Ok, found some resources that indicate thet the manifolds for the GTO and corvette are different.

Exhaust Manifold (C6 right): 12576061
Exhaust Manifold (C6 left): 12569388
Exhaust Manifold (GTO right): 12563278
Exhaust Manifold (GTO left): 12563277


looking that the GM part numbers on the heat shield: (on my manifolds)
12576822
12576823
These show up as corvette heat shield for 2005 to 2008 ls2

That sounds like good news to me as gaskets are available. This also indicates that i need the flanges to match a 6.0 2005 - 2008 Corvette. Off to do further research... If anyone knows where to get the corvette flanges let me know.


r6z4o6:
Thanks for the reply but those are what I would refer to as a "ball flange" and is definitely different than my setup :-(

philntx:
Not sure what those parts came from but the studs on them wont match up with my manifolds as they have studs as well.


Cheers,

Rufus