Frank, our RHD cars use the bendable lug down in the RH footwell - left side - just above the steering column hole, for the dipper switch loom.
The lug on the RH side of the battery box looks to have been for the main loom after it entered the cabin, but my loom strayed away after the rebuild.
That weird thin bracket on the firewall to hold down the steering column boot, was fitted on both sides. When the factory put through long runs of LHD cars, they deleted the RHD master cylinder cutout, probably to save a few pence per car.
Viv.