There are a few companies offering new "old" tires, even the Michelin XWX... But they are made using modern rubber compounds and manufacturing techniques. Best of both worlds: old style/new technology.
http://www.antiquetyres.com.au/michelin.html
http://www.vintagetyres.com/vintageindex.htm (choose "Radial")
http://www.coker.com/store/customer/home.php?cat=290
http://www.antiquetyres.com.au/michelin.html
http://www.vintagetyres.com/vintageindex.htm (choose "Radial")
http://www.coker.com/store/customer/home.php?cat=290