The brace + the locking wheel nut tools could be any where, there's no set location so in a bag on the boot floor or in the back door bin under the seat anywhere.
Jack handle along with the roof bar cross struts (if u have roof bars) is located in it's bag under the back seat secured with velcro straps.
The Jack is, as mentioned, secured with a velcro strap just behind the headlamp and above it secured with a turn buckle is the wheel chock, this is based on when you disco left the factory.
Other than the wheel brace and wheel nut tools my stuff is still in the above positions and unused.