Rear coolant manifold. Gaskets are item #2 in picture. This is on the back of the engine. http://realoem.com/bmw/showparts.do?...36&hg=11&fg=35

Removing it will make it so much easier to replace the hoses that connect the oil separator to the drain pipe. Oh, which aren't on your list yet.
Add to list, oil separator - drain pipe hoses. Everything on this page needs to be cleaned or replaced. RealOEM.com * BMW E53 X5 4.6is Crankcase-Ventilation/oil separator

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Olympic Peninsula, WA, USA
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2005 Mini Cooper 100k, British Racing Green/Silver-Black
04/2002 4.6is 140k, Silver/Black-Alcantara *FOR SALE*
1989 325iX 270k, Diamond Black/Black
1984 318i 370k *SOLD* (First Bimmer)
Honorable Mentions: '71 2002, '87 325, '90 325ic, '92 525it, '93 325i, '94 530i