Theres a company in Scotland called Motorsport World, they advertised Weitec 60mm springs and shocks. But then told me that these are no longer available; so I ended up getting the Spax setup.
The Spax setup can be bought with adjustable shocks, which costs slightly more. Heres the link to their site...
http://www.motorsportworld.co.uk/
QUICK CODE: 771B3
Product Code: TAP207