Ive once had a similar problem.
You can hunt out a set of Sunraisers, or ROH's,made in oz.
Or scrounge around a wreakers for a set of toyota surf steelies.
Theyre the right steel rim used originally for the 4x4 hiace.,15x7.
Its a good size as there;are lots of tyres to choose.
I found a set up in Newcastle,and theyre shit-hot.
Good luck.