Yes, they fit. That’s why this thread exists. [emoji1303]
And yes, that is the correct part number.
The dealership may also say that they don’t fit. But again, they do.
I had a funny (or disconcerting, depending on how you look at it,) experience with the dealer. I called with the spring part # everyone here is using. The VW parts department said "Yep, that should fit." and I ordered the springs from the dealer. Then I dropped them off at service and the service manager called me and said "These springs are not supported in the GTI, only the Golf." I asked if they would go ahead and install them, and they agreed to do it.
So the parts guy said yes, and the service guy said no. In the end, the dealer installed them (reusing the stock bearings) and they've been great every since. This is how the car should have come stock.
I admit, I do like the even lower look of the VWR's, but I drive in and around the DC metro area, so the DG's are probably as low as I should go.
EDIT: Part number ordered and installed at VW - 5G4 071 677 E