Reference OE/OEM Number 6 LAND ROVER RTC3612, LEMARK LRT029, LUCAS 400051, LUCAS 405468. Reference OE/OEM Number 7 LUCAS 410610, LUCAS DRB101C, LUCAS RA1, MOTAQUIP LVRA101. Compatible with a wide range of petrol engines, the rotor arm is a standard maintenance part for vehicles with traditional distributor-based ignition systems.