This Brake Master Cylinder Repair Kit pre 85 is designed to fit almost every Mini built prior to the dual circuit system, using the common .70" bore master cylinder. While the original size in the '59-'64 Minis was .75", most have since been replaced with the .70" size, so it’s important to check your very early models. This kit includes 1 ring seal and 1 cup seal, unlike later kits that come with 2 ring seals, ensuring an authentic and reliable repair. At Mini World Australia, we understand the love and care you put into your Classic Mini and Moke cars. Trust Mini World Australia for quality parts that keep your classic running smoothly.