To clarify what Legbreaker said, the 6x6 LRPVs used by the SASR were specially made for them and were not standard production line models. It was stated by JRA that they had a contract to build 400 6x6 Land Rover Perenties but that refers to all models such as the ambulance, GS truck and workshop bodies etc. That number actually increased to 690+ (but not more than 700).
The SASR 6x6 Land Rovers only ever numbered 27 vehicles from what I remember
If you want some blueprint type drawings, they are available but from a model-makers website and they will cost you Au$4.50 (about €2.66), the website is here
http://www.mheaust.com.au/MHE/Plans/plans.htm
P.S. the 6x6 patrol on the blueprint list is a British proposed patrol vehicle and is not the Australian SASR vehicle