These are pretty new and are available in 8.50 x 14, and also 9.00 x 15 as well as these. These are Stock class correct for late 60's early 70's (max 7 inch tread) and I remember seeing some of these on the street back in the day. I think these are more period correct as the piecrusts are more early to mid 60's vintage.
http://www.dragracetires.com/775-800...ag-slicks.html
Here's a better picture..these things look just like originals
http://www.mandhtires.com/store.php?...on=show_detail