Here are 2 x New Old Stock Brakeworld 20.6mm Rear Wheel Cylinders for 

Talbot Alpine 1.3, 1.4, 1.6 with Lucas Girling Brakes 1976-80

Talbot Horizon with Lucas Girling Brakes 1978-85

Matra Rancho 1.4 with Lucas Girling Brakes 1978-80

Simca 1100 with Lucas Girling Brakes 1977-85

Talbot Solara 1.3, 1.6 with Lucas Girling Brakes 1980-86models.