I did a little digging,searched "Pedders USA" and got a source for the Australian rear springs.
1-248-522-8021.
A distributor in Colo Springs,Rhett's Automotive 1-719-265-8083 took my order.I talked to George.They will be around $85 each and I should see them late August.I asked for the ones designed to carry a propane fuel conversion.These are reputed to give 2" lift.Kamiphloj
Pedders Rear springs
Pedders Rear springs
Like my old Volvo 544 with 4wd.I seldom regret neversieze or threadlocker