UK Takuban antenna conversion kit

[Spruce1990]

I've had a look at takubanmotorsports.com and he has a conversion kit to turn the aerial into a standard screw one (https://takubanmotorsports.com/product/genuine-toyota-antenna-conversion-kit-parts/). It looks perfect. I wouldn't mind paying the price for it, but due to him being in America, shipping is understandably astronomical. Is there any version of this in the UK?