If you have a left hand drive Mini and have any intention of driving it hard then perhaps it is time to consider a quality roll bar. This FIA certified rear bolt-in rollbar with removable diagonal brace can also be easily be set up for use with a front bar and door braces for the ultra serious racers. With the diagonal removed the rear seat of the Mini is again total usable.
International standard FIA spec is: International events require rollcages to have larger diameter main hoops. Recommended for all competition use. Rollcage certificates available. Material - Main Hoops=45x2.5mm/50x2mm CDS2. All other parts=38x2.5mm/42x2mm CDS2