Replacement aerial on 2.0 SE Coupe
 

Hi everyone, I'm looking for some help to replace the "standard" long wire screw in aerial on my 2002 2.0 SE.
I am ideally looking for a rubber bee sting aerial (black)
Everywhere i look (UK shops and internet sites) seem to have plenty of 6mm (male) threaded aerials but mine seems to be 8mm male?
Any one have any ideas where i could get what i'm looking for??
Any help would be most appreciated
Cheers
Jim UK