It should fit, but the shark fin is really only for the sat nav, you may still need a main aerial to pick up a good radio signal. Swmbo's GT has a shark fin but I think the radio aerial is in the heated rear screen. On the vRS I have tried the Sharan stubby aerial, reception was pants, so I went a bit bigger and fitted the Polo not quite so stubby aerial, reception improved but still not acceptable for me, so I refitted the OE one. If you fancy trying the Sharan aerial, I think I still have mine if you don't mind spending a couple of quid to cover p+p it's yours.
