Yes its this, its cheap for RB, but why would you put it on a track car? I would pay half that for a common kit that will get battered.
And it will require probably £x worth of fitting/fabrication cost on top of the £1000. Sometimes stuff just doesn't fit at all, when RTP were doing something on my car they showed me some side skirts a member had bought and they were around an inch too short, absolutely no fitting expertise can sort that out really!