Help! Truck Sized Bias Ply Wheels - 7.5x20

[357cstang]

I've got a project I'm working on and I need a few rims for a tube style bias ply tire.

6.5x20
7.5x20
8.5x20

Here in the States we've been using Radial tires for so long I can't find much good literature or retailers to buy them.

Anyone able to help me out? It's for an international project I'm working on.