Found this awhile back in the spare tire well of a 1982 300CD. 6Jx14M2, part number 1084000902.

I'll take the tire off and sell it for $75 + shipping:

Outside:
http://i62.tinypic.com/t69e11.jpg
Inside:
http://i58.tinypic.com/2ikfb7d.jpg
Part # stamping:
http://i61.tinypic.com/6p5d1v.jpg