After a completely exasperating and ultimately failed attempt to get Sirius to work with my 1/03 X5 w/ Nav (tried EVERYTHING, new radio, upgrade of Nav OS, 2 different car stereo places, BMW dealership, etc.), instead of giving up, I'm thinking of doubling down and upgrading the whole shebang with an Eclipse AVN6600. Does anyone know if the Eclipse unit will fit where the current dash system is? Thanks!