Dear Paul1
There is a easy way without changing the rear fender, but improving the look of the rear end a little bit!
You can buy from
www.badlandmotorcycleproducts.com a rear grey tinted LED lamp and in addition the grey envelope lights from the US version at a MOCO dealer.
Ask for Dan at BADLAND shop, he is very helpful. He made me a customized electronic device( sorry dont know the name in english), so I can switch by changig the plug to USA style( when braking all three lights are flashing) or EC style( when braking only brake light goes on)
The part number for a KRYPTONITE rear fender USA version is 59669-11 DFY.
I think you have a GREENIE, therefore I checked again in the parts catalog.
If you like to know more, just send me a PM or to MANO, he already has this on his bike.
To improve the look you can change the front indicator lioghts to grey ones, part nr. 69325-02.
I hope I could help you!
Aero8