I'll get more specific when I won't be writing from a smartphone, but here is some info that may be useful.
There are six sets of DG springs that are listed on the German Zubehör (DG) website. Three for the four door and three for the two door:
https://shops.volkswagen.com/de_DE/web/zubehoer/sport-und-design/exterieur/tieferlegung
These are all listed as Golf 7, and not specific to Gti or R. On Zubehör's website linked above, none of these springs are listed in the Gti or R's specific sections. Rather, they are listed under "Golf".
All of the spring sets are categorized per admissible axle load. All advertise a 25-30mm drop (from standard Golf height). All are labeled DCC compatible.
Five of the six sets share the same rear springs rated 890Kg. The sixth is rated at 950Kg with the following addendum: "NUR FUR MARKT NA" (not for north American Market?).
For the fronts, there are three load ratings: 930, 1010 and 1050Kg.
Here's how the coding works out:
4dr fr 930 rr 890: 5G4 071 677 C
4dr fr 1010 rr 890: 5G4 071 677 D
4dr fr 1050 rr 950: 5G4 071 677 E NUR FUR MARKT NA
2dr fr 1050 rr 890: 5G3 071 677 E
2dr fr 930 rr 890: 5G3 071 677 C
2dr rr 1010 rr 890: 5G3 071 677 D
I went to my dealership, parts manager took my Vin, entered it into ETKA and found my car's axle weights. Not permissible load, but weights. He then went to the Zubehör's site and found the set with the closest numbers. Problem was, Zubehör lists per admissible load, not weight.
Stupidly, I did not check, so the 5G4 407 677 C set (930/890) was fitted to my car. Result is not good at all: very positive rake (2 finger gap in front, 3 rear), and the front springs simply do not suit my 4dr PP MT6 car. Bumpstops are sollicited way too much, front end feels vague.
Rear feels great, although I do notice the rake dynamically (I am very sensitive to cars' setups but I'm sure most would notice too).
Question now is: should I go with front springs in 1010 or 1050? Per my car's handbook, front from stock requires 1020/880...
I'm afraid the 1050 fronts would be too stiff/ride high. And I also think the fluke 950 rears would also be too stiff/ride high.
So unless I find more info, I'll go with the 5G4 071 677 D set (1010/890).
In any case, from my experience, the 930 fronts 5G4 071 677 C are too soft (rears at 890 being just like OEM, with a 10mm drop).
I'll post pics & info as I get deeper into this.
Hope this helps,
Ben