Viscous Fan Coupling Unit This listing is for a new replacement viscous fan coupling. Please note: This will not fit the TD5 engines. This corresponds to the following part numbers: ERR4996 This will fit the following vehicles Range Rover P38 - Petrol V8 EFI engines Land Rover Discovery 2 - 4.0L V8 EFI Please see our other items for thousands more Land Rover and Range Rover parts and accessories.