Found these for you. Hope this helps. http://www.longstonetyres.co.uk/page/26-61-15-michelin-tb5f.html
And shipping to the U.S. is free from longstone.
Sharx Design
12540 Upper Fredericktown Rd.
Mount Vernon, Ohio 43050
(740) 358-0001
http://www.sharxskinz.com/
Example of their work
http://www.magix-website.com/mppo12/10/F19/F19AD800F65A11DEB1B4C5CB185F4B0A.jpg
A long long time ago I had them in my S10 for about 500 miles. Anything over 2700rpm and it would knock pretty bad. Put ACs back in and it's ran fine ever since.
Someone will most likely buy it for the VIN tag and the drivetrain. Restore everything that's able to be restored and put it and the VIN on a body from someone like Dynacorn and thus they have a "restored numbers matching" car again.