The original RR part numbers were UD23201 (driver) and UD23207 (passenger) for LHD cars or UD23202 (driver) and UD23206 (passenger) for RHD cars. These were for the original side-pin fixing which RR discontinued a few years later. In the main you would now use UD73700 (driver) and UD73702 (passenger) for LHD cars or UD73699 (driver) and UD73701 (passenger) for RHD cars. These have the centre fixings for the blades and also need the small plastic clip on one side. Hope this helps!