Thanks for the reply Carnivore, Its a 99 striper 5.0 Gi Volvo DP. I've checked marine parts express they seemed expensive also checked Moore performance alot cheaper but they offer GLM brand and I read on another site they have had problems with cracks. I'm going to research it some more
I have the GLM manifolds on my boat and haven't had any problems. The GLM gaskets are pieces of shit though so buy the OM gaskets from Volvo. I also had to polish the manifold/engine surface and the manifold/riser surface because it wasn't quite smooth. The quality is definately not as good as Volvo, but at 1/4 the price.....
I got mine from a guy on ebay (in Azuza, CA or something).