Stuart,
This one should fit.
Ozmo Engineering RSX Carbon Intake Manifold
We have been looking for an oportunity to test fit one. Unfortunately it is a short runner manifold and is better suited to forced induction or super high rpm applications. A FAST LSXR 102mm manifold will provide nice gains. A set of Mast Motorsports LXR heads, cam, intake manifold, and 102mm throttle body will put you to 600 whp on a ls7 and 560 whp on a ls3.
Cheers and let me know.
Luke