lots of unique parts on these .
front chassis legs have notches to allow the axle movement up and down ,
floor on the front left beside the passenger knees has a bulged to allow space for the transfer case
different front and rear hubs , brakes , front arms , steering rack (not a box) . front struts etc
sump has the front diff bolted to it, one axle goes though it.,
pretty much same design for the front setup that they used for the X5 models
http://bmwfans.info/parts-catalog/E34-Touring/Europe/525ix-M50/R-M/browse/engine/oil_pan_oil_level_indicator/
http://bmwfans.info/parts-catalog/E34-Touring/Europe/525ix-M50/R-M/browse/transfer_box_electric_gearbox/transfer_box/
http://bmwfans.info/parts-catalog/E34-Touring/Europe/525ix-M50/R-M/browse/front_axle/
http://bmwfans.info/parts-catalog/E34-Touring/Europe/525ix-M50/R-M/browse/brakes/