These tyres won't be available through Tire Rack. they are specialist tyres. In the US They are available through Lucas Antique tyres. try this links.
The 345/35 is so new they don't have a link up yet, but it shouldn't be long.
Any way the best thiing to do is give those chaps a ring and see what you can arrange with them. they have a container en route. -- 1(800)952-4333