(ha ha @ Paul)
Yes, I have run the Tekin G11-Pro in my X5 and Dan has too. I found it quite a nice fit. It fits very well on its side at the front just infront of the motor, and the receiver wire is perfect length to reach the receiver when the receiver (KR301F) is mounted at the back righthand side. It would also go on the left hand side just as easily.
I know Dan has mounted his this way too (I copied his layout, he was first to do it)
Have a look on
www.4wdrc.com, there is a forum there and in the X5 section there is a thread named "Neat wiring", I think Dan has pictures of his Tekin mounted in the X5 in there.
Chris