Help identifying cause of oil leak

[1paranoidandroid]

Hi all,

My 2003 Eurovan Weekender, which was in otherwise excellent shape, has started leaking a lot of oil and the oil warning light flashes and beeps.

I was hoping it was the oil pressure sensor or the o-ring had got caught up, but it's not. A significant amount of oil is flowing from the bolt pictured above. There are no Eurovan mechanics in my area so i'm tackling it myself. Any help identifying what this is and a possible fix would be appreciated.
Thanks.

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[trunnion]

Oil pressure switch 06A919081J

[EuroTec]

Oil filter adapter o-rings. Common leak. You need 2 of these.
Part #407757100
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