Whoa that's a hard one.
Panel vans run a different cluster, but still run the same 3 plugs (different pin arrangement though).
No KE70 or AE71 aus delivered has those plugs.
Maybe worth trying T18, not sure if they use those plugs.
Otherwise, self serve wreckers are the go, just start pulling out old clusters in early 80's Toyotas till you find the right plugs.
FYI there is Northern Auto Wreckers in Londonderry that has a heap of assorted old cars.