Hi Michael,
There has been a two part article on the 4x4 and 6x6 Perenties in Classic Military Vehicle magazine recently, with a table of production numbers for each variant. It shows that in those 6x6 Ambulances built in the period 1986 to 1992, there were 76 ambulances built, then from 1996 to 1998, the Bushranger (and Perentie follow on) there were another 16 built.
regards,
Richard