My X5 had a bmw 750lL fan and clutch installed in the vehicle prior to my ownership. I only found this out when I attempted to replace the clutch fan because it was making some noise. When I went to install the new clutch fan I realized that it was different and then ran the part number of the old cutch fan and found out it is from a 750IL. In addition the fan is completely different than the one that would come in the 4.6is. Instead of of a nine blade fan the 750IL is an eleven blade. So I returned the new clutch fan that I had for replacement and installed the 750IL.