 The sixes also came with larger brakes (60 mm ventilated front discs and 25.4 mm rear finned drums) and a tandem brake reservoir.The six-cylinder Hemi cars used a 5-stud wheel bolt pattern, and the early four-cylinder cars used a 4-stud wheel bolt pattern and only featured solid unventilated brake discs.Later four-cylinder cars shared the same brakes and stud pattern as the sixes, and thus the same wheels.