[spdbrake]

American Racer shows DOT tube type tires in the Cobra sizes.
American Racer tires from Boubin -::- - Products
The 295/50-15 rear and G60 front are the correct OD and width.
American Racer tires from Boubin -::- - Products

I don't know if they're really DOT stamped or not. Price point is cheap...

http://www.americanracertires.com/content.php?id=1