don't seem to be any up to date figures on the current model X5. I'm sure since 2003 they will have fitted isofix in rear can't remember.
Here is what EuroNcap has got the current X5 think it will be good to see how the new model rates against the likes of the Q7 etc.
Please note if you do a search you will find motor cars to be more safe than the off road cars Obviously this is for Europe know idea how it works else where.
http://www.euroncap.com/content/safe...ings.php?id1=9