Rimmer's isn't correct, the Rover 75 & ZT dont use the same fog lamps.
ZT fog lamps are round, 75 fog lamps are oval.
Rover 75 pre facelift:
XBJ100260 - RH
XBJ100270 - LH
Rover 75 facelift
XBJ105500 or XBJ105501- RH
XBJ105510 or XBJ105511 - LH
For all ZT (both sides)
XBJ000010