Not satisfied with the answers I'm getting on Jeepforum. Check the pics in the thread. The plastic piece is just one piece, I just tried to get pics from different angles. It's about 2" x 1" square, but it likely broke off something larger.

Jeep Wrangler 4.0l inline six.

Thread here:

http://www.jeepforum.com/forum/f12/help-me-identify-what-i-found-my-oil-pan-pics-1359139/

any ideas?
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~ John