Kit consists of 4 off  O- rings 

1 off for layshaft part number 19030032 (Nitrile rubber 70 shore)

2 off for clutch/ selector shafts 19031013 (Nitrile rubber 70 shore)

1 off for rear brake arm 19059021 (Nitrile rubber 70 shore)

O- rings are of the highest quality and are sourced from a UK based manufacturer/ supplier