hast Du schon einmal unter dem Ruecksitz nachgeschaut nach dem Zettel. 490 sagt nur Sonderlackierung unspezifiert. 490/3 muss dann was genaueres sagen:
Sonderlackierung
These are the paints produced by BMW Individual. If the refrence label on the passenger shock tower says "490" then it was painted in an BMW Individual Color. M5s after 10/94 carry a label that says "BMW Individual" on the shock tower and a more specific color description or paint code number. 92 of the M5 Tourings were ordered with "sonderlackierung" colors.
car owner's with an unidentified (490 U - Sonderlackierung) special-paint car and/or in doubt about the -contrast-skirting-color should ask their BMW-contact to obtain confirmation from the M-GmbH via the VIN-ref of the specific car -
Hier hat z B einer
490 L A C K I E R U N G
Sonderlackierung "sepia-metallic" (FQ 95-4477/BASF)
http://www.zroadster.com/forum/showthread.php?t=9101