wow you need to do some serious reading and learn this stuff. Part b is a EGR valve connected to the EGR tube which threads into your exhaust manifold. As far as it not meeting up with the manifold goes or threading in? One would have to inspect the manifold in person to get an idea to what exactly is going on. There are a number of variables going on here that you have not told us.
Is the manifold a S14 or S13? Is the EGR tube from a S14 or S13? Are you trying to mix and match? I am sure you do not know as if you did? Then you would be able to figure out what to do.
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