Not strange. GM built the A5S390R transmission for BMW and the 3.0d up through September 2003 (based on the parts book).

So, is 12/2003 your purchase date or your build date from the label on the door jamb?

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue