To lower the arse of a MK6 1998 you'll need to do a bit of fabricating to get it spot on.
Axle flip is only part of it, as once that's done, it drops about 90mm and far to low for most of us.
To bring it back up, where the leaf springs mount to the rear of the van, I made longer by 50mm brakets, to raise the van back up.
Heres how she sits with 17's on.