Hello all. I am following up on my head gasket saga. http://www.4x4wire.com/forums/showf...;amp;page=0&fpart=3&vc=1 I went for a full rebuild. Now, at the final stage, after much headache, I find that the throttle body assembly on my V6, 3.0L, has a cooling unit between it and the intake manifold/plenum. Do I need 2 gaskets? What brand should I buy?

This is the cooling unit front view:
[Linked Image]
[Linked Image]

Top view:
http://pic70.picturetrail.com/VOL1791/8671937/24603075/410371881.jpg

Rear view:
[Linked Image]

Diagram with no reference to cooling unit:
[Linked Image]

Why is the is the cooling unit missing from the diagram?