Ron,

I don't recall the source of the tires. They looked like giant Dubros, but I suspect they were not. And I don't recall them being much over 6-7" inches. I believe I still have a set (used but servicable), if you are interested I'd be happy to send them to you... they are no use to me gathering dust and I'd be happy see them flying:-)

If you are interested let me know and I'll measure them.

The AMR ones are fine, I am sure they would work for the BUSA Stearman if they are the same ones they use on their Waco.

Dave