Working on 01 f250 5.4L There is a difference between the 2 manifolds. The one I pulled off has slots on it to put gaskets at each opening. The newer one does not. I want to put the old one back on but am curious if I need both kinds of gaskets with it.The 2 gaskets are;Auto zone part #MS92836-1 and Auto zone part #615-188G The second set would fit on Auto zone part #615-188, which is a dorman intake manifold; this is the manifold I will be putting back on. Do I need both gasket sets or just the set that fits with the intake manifold #615-188?

The newer one, which is ford stamped, is causing ~ -23 LTFT, the older one does not. The newer one also has a larger body on the bottom half. Thanks in advance