Yes I could just add any old light under the bumper but I would prefer to add the correct light so that it matches the Left Side then I can leave both wired in, On the GCC cars they have left fog and reverse in the cluster but just reverse on the right, on my old 70 it had both lights, as do the AUS, SA cars. If I add a different after market fog I will have to remove the left hand cluster one as they have to match for IVA or it has to be a single light on RHS or centre
The Stop, tail, turn lights are in the bumper and I will be adding an alternative bumper down the line but will need to retain lights there.
Iwan I too swapped my UK spec D Pillar lights (fog /reverse) to EU spec (stop/tail/turn) so I could eliminate the bumper lights, I cut the RH fog into the reverse light with a red bulb which was fine for MoT but won’t pass IVA