I could not find a link to a V23 disk image anywhere, but here is one for V22.1. This one should get your MKIII to OS Version 3-1/63, which is the latest available for the MKIII.

http://www.e38.org/nav/v22_1_CloneCD.rar

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SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input