I have one of these that was at one time installed in our 1989 Grand Caravan with the matching Infinity II head unit. Unfortunately, sometime between removing it from the van when I sold it and now the extension cable and cartridges have disappeared (probably hiding with the 10mm socket). I want to install it in my 1986 Lebaron convertible and it will have to go in the trunk so I will need the cable. I was hoping Jeremy Schrag might have done a takeapart and repair guide on these but he hasn't. If anyone has an source for either the cable or the cartridges I would be interested in them.