hi there, i have a 6 in dash vw cd player i bought off ebay, on the lead that connects into the radio it has blue connector on it (the cd seems to works fine) but on pics of othervw cd players on ebay it has an extra yellow and green (aswell as the blue) connectors can any body tell me what they are for or if i need them to for something to work properley on my cd or radio cheers jenno69