Reference OE/OEM Number 12 KERR NELSON IRT011, LEMARK LRT005, LUCAS DRB441C, LUCAS DRB442. Reference OE/OEM Number 8 FIAT 82316498, FIAT 9927962, FIAT 9927967, FORD 1606399. Compatible with a wide range of petrol engines, the rotor arm is a standard maintenance part for vehicles with traditional distributor-based ignition systems.