Inlet manifold seals

Hello,
My first post on these forums after using the resource for sometime. I've got a K12, and have just been having some trouble with PO171 errors. I've changed the spark plugs, and air filter as a first step. While changing the spark plugs I noticed the seals on the air intake housing to the inlet manifold were a little perished and had a few cracks possibly leaking air. Would anyone have any idea where to get the seals - I've tried a few online places, my local nissan dealers, Euro Car parts etc etc with no joy. They just want to sell me the inlet manifold gasket but the seal I'm after is the other end of the inlet manifold.
Thanks in advance.
 
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