found in anything from 3 series to 5 series and in landrovers from about 1993-98
as long as it ends with a D (for ex: 325d or 525d I actually think a 7 series had that motor as well as an opel LOL)
wiki link http://en.wikipedia.org/wiki/BMW_M51
and yes go to ebay.de use google chrome to translate from german and buy an entire drivetrain with ECU for under 800 bucks