Hi, I have recently bought a 500 second hand, the radio was sitting in place but not doing much, so I took it out and discovered that not all was plugged in correctly at the back, and clearly the old owner had put a new radio in but shoved the old one back in before selling it - but the wiring plugs now no longer fit the original radio. Can anyone advise me on what I need to get to make the original radio to work? Are there adaptors or do I have to re-wire the whole thing with the correct connectors - and any advice on where I can get the correct connectors or adapter? Thanks