Just did this lift to the rear of my 2005 Golf. Worked like a charm.
BONUS,
I found the perfect spacer to use for the top of the new airshock, from the old bushing right in the old shock lower end!
Look below the 5 to 6mm on the tape below: There she sits, molded in the rubber on the old shock.
Just drill in multiple spots around the molded rubber. then hog it out more by working the drill at a side angle in the rubber. Once you've chewed up and weakened the rubber all the way around, twist it out with a vice grip, then whittle and shave off the remnant of rubber left stuck to it with a knife.
it's a perfect fit for the top, both diameter and length. It fits perfectly properly inside the hole in the cast aluminum OEM top shock mount, And it's a solid bushing to boot! (Note that the below pic is not of this reclaimed bushing, but the result will be near identical)
I also carefully cut off just the mounting tabs on the new air shock bottoms (with a Dremel), leaving the not-factory-smashed tubular part undisturbed and still in the new shock's lower mount bushing, and then hammered & worked it back to round with a tapered socket (1/4 drive deep 1/4"). You could also squish it back round using a vice if you left a bit more bushing end to work with when you cut the flat mount tabs off.
Then grind the messy ends down a little to make them nice and flat, and the right length for spanning the lower mount.