Reference OE/OEM Number 6 KERR NELSON IRT007, LEMARK LRT007, LUCAS DRB447C, LUCAS DRB462. Reference OE/OEM Number 7 LUCAS DRB462C, MOTAQUIP LVRA345, MOTORCRAFT EDR118, OPEL 1212217. Compatible with a wide range of petrol engines, the rotor arm is a standard maintenance part for vehicles with traditional distributor-based ignition systems.