There are two options here... one is to go for the OEM autochanger which your Renault dealer will be able to supply, but this will be very expensive indeed (I would guess around the £400-500 mark, but I dont know for sure). The second option is to go for a universal aftermarket changer unit which uses a wireless FM transmitter to send it to your radio. Try Pioneer CDX-FM677. If you have it set up properly, it can sound perfectly good, but there is a risk of interference, and the sound quality might suffer. Hope this helps mate.