car stereo ariel adaptor to fit normal DIN stereo?

[manikm]

guys, ive just fitted a Kenwood stereo, the ariel that plugged into the factory CONCERT stereo doesnt fit my new one?
do you know where i can get an adapter for this!?

 

[manikm]

Thanks mate
Is it called anything particularly special?

 

[Speedy]

Can't remember but they are normally hanging on the shelf in Halfords..