Most go for the Pug/Citroen stubby which are around a fiver off e-bay. I have BMWs Sport stubby on the Z3 but alot costlier. I've left standard on the Z4, can't bring myself to fit French parts on a German car
I've got one you can have I paid £6 off eBay looked ok but my other
Half wasn't keen.
Send me a private MSG with your address and I'll post it to you
P.s it worked fine and I've got DAB.