Replacement power cable for BC-SGPS

[OR002]

I have a BCD536HP in my truck and I want to add the GPS option. I bought the kit with all the cables, but I'd like to hardwire the 6v power cable and I don't want to destory the original cigarette lighter plug. I already have a 12v to 6v convertor, but I'm having trouble finding a replacement power cable.

Does anyone know of a replacement cable, or connector, for sale? It's not the standard 5.5mm x 2.1mm (or 2.5mm) like most DC power cables.

Thanks