Rotor Arm (Red) Improved Suitable for 45D 4 Cyl Distributors.Distributor Rotor Arm Suitable for 45D 4 Cyl. Distribuotrs . Improved "Red" Type Brass inlay is integrally moulded and dispenses with the retaining rivet. Non conductive resin, ideal for standard and high volt coils and electronic ignition. Strong spring steel clip and tight internal tolerance ensures a tight shaft fit. Available for four, six and eight cylinder MG models. Guaranteed against defects in materials and or workmanship for three years.