The extinguishers shown here are all on the FIA Technical List 52. These extinguishers are suitable for where regulations require a 8865 homologated extinguisher to be used. If you have any questions regarding their suitability etc then please call or email for further assistance. Raceparts recommends the systems listed as Small for competition vehicles which are derived front seat only road cars and those listed as Large for those with both front and rear seats.