I didn't realize another device was required to enable the adaptor to work! I have seen the contraptions that others had made earlier to make adaptors fit older X5s, but figured we were past that. If I'm not mistaken, the snap in adaptor works properly in (some) other models of the BMW without further equipment. Are you sure an eject box is required for the '07 E70 in particular?

__________________
BMWs: 2007 X5 3.0
2002 330xi
1991 525i (ret'd)
1985 325e (ret'd)