Hi, I have replaced the cassette radio in my Astra - I found that the best option was to buy a VDO replacement - slots straight into the existing radio cage without messing about with wiring and works with the remote display and steering wheel controls. Other units will work - but you must buy extra 'bits' to make them work with the car controls/display - my advice is to stick with the VDO unit. For info. mine was the CD441X £180 from Vauxhall - has it about 6 months now - its rock solid.