Its the same disc as the BMW X5 E53 2002-2006 AFAIK - lots of sources of discs on ebay, get the CD for the Mk3 and the DVD for the Mk4 - theres a guy called Mick G who does these discs for BMW owners but also Rangies - I think the email was
[email protected].
I use the update in my BMW X5 and...