Re: exhaust manifold
The exhaust manifold gaskets have different part numbers but that doesn't necessarily mean the headers will not bolt up. Here's a suggestion if you don't get a better answer from someone else...
Buy an X3 gasket, unbolt your stock headers, and see if the new gasket will seat properly. If it does then the headers, in theory, should bolt up properly. Try it at your own risk though.
By the way, got any pics of your car?
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