There are two versions of the 6m extension cable.
One has quadlock on both ends female/male connections at each ends respectively.
These might not work as some radios have different pin locations but all quadlock connecting to the car is the same.
The other verison has 20-pin on both ends and this works one most radios even if the pin outs are different because in the end you are just extending the wires in between the connections.
This is the one I bought:
http://erisin.kancart.com/item_detai...S3446B#!detail
Most Android units use this connection: