Description Reviews This Cometic MINI Cooper head gasket is in stock and ready to ship! We offer 3 sizes in stock .027 (stock), .036 (thick), .40 (Thicker, warehouse stocked). Cometic also makes .030, .045, .047, .051, .066, .075, .098 which are all special order. A new gasket is required anytime you modify or replace the head on your MINI. This head gasket is specially designed for engines with an aluminum head and iron block. Will fit and work on all Gen 1 MINI Cooper's (R50, R52, R53).