My contact at a local BMW dealer said that she can pull window stickers for cars sold from that dealer.

So maybe if you could find where it sold from originally, you could get the sticker...

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2002 X5 4.6is - Titanium Silver / Black Alcantara - Dinan Stage 2 - Bilstein/Eibach - Brembo BBK ----SOLD---
1993 318i - Brilliantrot / Tan - bone stock daily driver