they dont sell a kit as such you need to make it and for that it shows you need:
2x S2 , 2.5" strut @ £350.each ( £700 )
2x D1 , Adjustable damping damper @ £165.each ( £330 )
2x Eibach coil spring @ £65 each ( £130 )
add some vat @ 15%
= £1334
nicked from jays post on another forum