Hallo my German friends, sorry but I do not speak any German. Some of you may know me and my website. Last year I found that the Forfour stereo fitted the 451 and the 451 stereo fitted the Forfour (you have to move wires). It might be interesting for 451 owners who would like to fit the Forfour Navigator or Forfour owners who have the Radio 5 and want to upgrade their stereo to the 451 Radio 10 that played MP3 CDs.