Thanks for the clarification about the Johnson/Zakspeed cars.
So the Bill Pye car is the one that went to New Zealand in 1987 and stayed there untill it was rebuilt by Ross Donnelley. The car is now running on white 5-spoke rims. On the DJR website this car is called Zakspeed 1, as it's the car that first arrived in Australia and was used at the 1984 Bathurst practice. This car was used throughout the 1985 ATCC season and ran as no.18 in the 1985 Bathurst race. It was in JPS colours for the 1986 Wellington 500 and remained the spare car for 1986 before getting one last run at the early 1987 Wellington race.
The second car which is now owned by the Bowdens is on golden multispoke BBS rims. This car also has a non-standard hood. I don't know too much about the cars whereabouts after Dick Johnson retired it after the 1986 season. It showed up at a Sportscar race at Wanneroo in the mid-late 90's in the hands of Ray Miles.
This car is called Zakspeed 2 at Johnsons Website, making it's debut at the 1985 endurance rounds. Johnson claimed the only win for any Group A Mustang at the very first Adelaide GP support race that year. This car stayed the main car for the 1986 season and was sold at the end of 1986.
I've come across a site which has photos of all known Aussie Group A Mustangs. very helpful
http://www.mustangracing.com.au/group_A01.htm
So we got the 2 Johnson cars.
2 Pinepac cars, one previously used by Don Smith
The Lawrie Nelson car
Another one for Davison/Kramer which showed up at Bathurst 85 & 86
A car for Kevin Clark which ran in various liveries and shapes.