Hello… have a V70 year 2000 (already new model). …inbuilt is a HU403… now I have bought a HU803 to install it myself afterwards. Now my questions: -on the new HU803 is only a big plug in at the back… I thought there are always two… who can say something about this? -and pure to the conversion: how can I get the old radio cleaned up and the new one pure? have found no self-help book… many thanks for your help…