Hi,
If you just want the Shark Fin to look nice, with no functionality, they are available on a well know auction site for less than £5!!
Be careful when you fit any of the Shark Fin typr aerials as it is all to eay to move the headlining down a little too far to make it easier to access the nut that holds it on the roof, with the consequence that you 'crack' the headling!