We have a Koleos and my 1973 15TS. The Citroen C5 was sold to make way for the Koleos. A few years ago I tried to get a 505 but ended up buying a SAAB 900 which I'm now selling to hopefully make way for a Citroen.
Why specify such an old Xm? My guess is that there are very few of those early ones in Australia. Also, I believe that the S2 electrics are much better (1994 on). You can still have a PRV V6 with 4HP18 up to 1996 (1997-2000 have ES9J4 engine with 4HP20 transmission).
There are no doubt personal imports with other engine/transmission options, but only V6 automatics were sold new out here.