I've had a set Milners springs on a sportrak, i went for the HD versions, gave me extra 1" lift but was as hard as nails on road. Might be worth looking at other options. I believe Jeep XY springs will fit nicely and provide 2" lift without the bone destroyin ride. Try lookin at Pauls sportrak on WWW.MACSPORT.CO.UK
or give Paul a ring, nice chap & very helpful.