The dual circuit brake master cylinder with part number 113-611-015 is a 19mm bore diameter cylinder. It applys to Volkswagen Super Beetle 1971-1979, Standard Beetle 1967-1977, GHIA 1967-1974, Thing 73-74 and etc... The center to center inlet spacing measurement is 85mm. And the reference EMPI number is 98-6203-B.