I have taken my intake manifold off to replace my imrcs with deletes and my fuel injectors. Can someone help me out, I have looked everywhere for the lower intake gaskets for the imrc's, I have even went to the ford dealer and was told by pretty much everyone they dont make them anymore. I found a part number on rockauto IG4171A but it doesnt specify if it is the upper or lower gaskets. My imrcs were plastic the ones I have are aluminum so I cant go off what I had as a picture reference.