There are all the mountings for one, but no actual kit at this time.
The only time I've ever used one (I re-shaped a B4 black rear rollbar) was indoors at Durham once on carpet. The carpet had been used for snorers with additive so it was worked into the carpet, we were running about 5mm ride height and still getting grip roll!
For grass, astro and normal carpet the front rollbar isn't needed
