My 6 unit CD Changer (mounted in the trunk) has stopped working. I have found a firm on-line that will swap it out for a reconditioned one for just under $500 (expensive for a reconditioned unit, which is likely to fail again). I contacted Harman Kardon to see if I could purchase a new unit and they responded that they supplied only the amplifier and the speakers. The CD change was furnished by a subcontractor (manufacture name does not appear on the unit). Does anyone know if CD changers and their cable connections ( two separate cables in the trunk) are an industry standard design? In other words, can I buy any trunk mounted CD changer and hook it up to the the BMW head unit? As an audio enthusiast, I enjoy the high quality sound associated with CD's, and do not wish to downgrade the sound using MP3, I-pod, or other low -fi music sources.