A little over 1 year ago I bought a GPS Corvette Bubinga 6. A few months ago I started to notice that the jack is noisy. I asked my dealer to replace the jack, but he claimed that he could not get the part. After checking on the Warwick website, it seems to me the part i need is the “Professional Socket + Lead”. But I don’t know which one I need? The SP W 50100 C R5 or the SP W 50100 C R4? What's the difference? Anyone can help? Thank you.