Thats right for a 98 Disco only the ones in the bumper, for some stupid reason they don't connect the ones on the body. I have wired mine back up so i've got 4 lights as per earlier Disco's.
If you want look at the bulbs in the body lamps they are still the twin filament (stop/tail) type and the wiring is there but only as far as the connector (the pressed bits of metal that make the circuit from the bulb to the connector finish short).
Its not too bad a job to get them working, you need to take the lamp cluster out of the boby and solder a wire onto the metal bit by the bulb, then connect the other end to the wire that goes to the connector.
If your still not clear on that I can try and get a picture for you.
Hope that helps.
Jon.