Hi Alex,
The lack of replies to your post are a clue!
I've shopped around and can save you the hassle, it appears there are none left!
Someone on here put the springs for the 2.2+ on a 2.0 but it's not something I would do.
When I enquired, Garry at Motorsportworld suggested the H&R kit which is listed as suitable for all models of Z4. He said they are probably the best springs you can buy. £191.32 the set. You get an extra 5mm lower too! Garry is a top bloke by the way. Went well out of his way contacting Eibach and checking all sorts of data to make sure I got the right info
Best of luck.
Cheers,
John