Height and damping adjustable SPAX. I use them for street and open track and like em a lot! It's easy to adjust ride stiffness for street and track use. I've found that for the track, softening up the rear to get the car to squat, helps make the car bite where, with a stiffer setting, the rear would tend to step out.
Good luck, Pete
PS see ERA parts list or
http://www.spax.co.uk/