Ive been looking around for these for a while now. It got to the point where , while i was sitting in traffic i was checking out other cars to see what they had that might fit.
It looks like the ones on the earlier Octavia's might fit with a bit of tweaking - the sills look similar in profile to the side skirts on the facelift cupra's but i havent managed to get my hands on some to see if it is a close enough fit.
Not a great
help to you but there maybe something off another make/model that could work.