Lowboy Tires wanted

[Enckway]

Looking for tires for our 68 Rogers 40 ton. They are 15". One's that just blew were 10.00-15 14 ply tube type. Wouldn't be opposed to tubeless mounted on rims either. The back axle is 12.00-15 but i hear they are hard to find. Could make deal at cortland? Thanks Brian