Im pretty sure the Octavia cup suspension uses SACHS dampers...
KW do a kit the same as this also, but you will be looking at around £5000 + for just the dampers, and it wont last very long using it on the road!
There are other ways of getting round it tho if you know what your looking at, im looking to have some rears made this way so i can go for a rod type tow link (the arm that the spring usually sits in).
For road and trackday i would say go for the KW Clubsports, they come with 60mm diameter race type springs front and rear so you can get all different spring rates easily!
Its better to get more stiffness through re-valving the dampers tho instead of using stiffer springs...