You require 5 of these high tensile short head studs and they torque to 42lb/ft. See also complete kit which includes these top grade studs
C-AHT279. 3/8"unc stud with unf end for head nut and is 4" long. See other long head stud
CAM150 5.75" long. Cooper S requires head bolt
C-AHT281.
Also used for the oil filter head to block (pre spin on filter)