Deautokey was the type I've used, and on my mk5 too.
Only thing is I have to run a wire branch to the left side to be able to use a second light (because packages block it on right sometimes).
I chose blue to get rid of the white lights at night, and to match the Cornflower Blue. The color change gimmick seems..... less useful.
There's already enough red in the car.
https:/--/deautokey.com/category/shop-by-car-model-vw-gti-golf-mk7-5-2018