The option packs available from JCG included spots, 5x12 minilites, corner bars and some other stuff
The only 'genuine' pack for these cars was the engine conversion though. It was a dealer fit Rover product that could be ordered through any dealer with a new Racing/Flame/Checkmate and was covered by warranty. These cars were the start of the late Coopers and when they were first introduced it was very much an experiment, there was no close relationship between Rover and JCG at the time.