I just installed Grille Kidney and it's pretty easy to install.
I have 2 (two) pairs of Grille Kidney for X5 2004-2006 one is EOM with titanium/chrome indy shop painted (used but very nice) and another is aftermarket chrome grille kidney w/ high quality,
anyone want to buy it PM me i will offer cheap. I have extra since I got very cheap from local craigslist.