OK, sounds like it should just be a blanking plate on mine then.
The manual is a bit strange. There's a load of useful information in the sections titled "Introduction Technical Data", "Engine", "Electrical Equipment", "Auxiliary Units" and "Bodywork", and absolutely nothing in Clutch, Gearbox Differential, Braking System, Steering, Suspensions and Wheels. There's also an appendix for the selectronic stuff. I guess all the missing information is unchanged from Volume 1.