You're probably not going to get anything that will fit in the dash and look original. I've checked on Crutchfield (big aftermarket stock of car electronics) and NOTHING made for the E70 or it's fiber optic bus. I skipped the factory navigation (I can hear the clicking of tongues already) and opted for a big screen Lowrance unit after I read about some of the problems with the first factory units. I understand most of the problems have been addressed and the factory unit is very good now. So, personal choice, if you like everything neat and in the dash, the factory is the way to go. If you don't mind a dash unit, which you can easily upgrade to the next generation of GPS gadgetry when it comes out, then that's the way to go.
