does your head have round exhaust ports or square?
on your head on the side where your sparkplugs go, right above where the head meets the block there should be a casting number (a letter and two numbers) does it say W58?
all i have left (besides what is on my car) is a stock 510 (squareport non-egr) exhaust manifold.
you should check ebay, but make sure you know which ports you have.