Exhaust manifold back pressure sensor tube

[Chamberpains]

Here a question for that gasket. I searches my cm870 ESN 79115692. I came up with 10 pages of exhaust manifolds well over 100 results on quickserve. All of them are for different turbo arrangements. By the time I went down through most of them, I saw that 3683940 # for that gasket. But those manifolds look nothing like the one on my 06 International 9400i. By the time I got 40 or so clicks in I started to see my manifold and it doesn't show that gasket. 1st off how do find the specific turbo arrangement # for the engine and 2nd why doesn't mine show a gasket?

Here is the manifold shown in most pics. The gasket is #7
   

Notice the 10 pages of results. All with different turbo arrangements.
   

I finally started to see mine on page 4 but it was not pulled apart. On page 10 I found the same style pulled apart. Notice no gasket...
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