In Europe at least in Poland i changed my springs to German Eibach.I lost my warranty (only suspention) since the parts are not made by VW.If you want to keep your warranty you have to get the springs from VW and have them installed at your dealer. In Poland there was only one option for the springs.The ones which are in the option for the car called "sport suspention".Those are springs made by VW using the standard shock abosrbers lowering the car about 2cm. Eibach lowered the car by 3.5cm. Later after you change the spring you have to adjust some elements of the suspenion.That also has to be done by the service at VW.
The second option is (more expensive) the VWRacing springs.Hard to get in Poland.Though in the UK they have an online shop.
Sports Springs - Volkswagen Racing
Those are for MK6 and 5.Read somewhere that they do have those as well for MK7.
Bare in mind that it will cost you way more to get the springs and install them at VW service.I paid like 50% less for the Eibach springs plus the cost of installation cost me about 1/4 of the price suggested by the service.
Also check this one:
H&R vs VWR lowering springs- I bought em both... - GOLFMK7 - VW GTI MKVII Forum / VW Golf R Forum / VW Golf MKVII Forum
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