If you want "correct" tires, these are the only reproduction tires available.
F70/14 Speedway Wide Tread RWL, R/S, W/S
http://www.kelseytire.com/pages/preformancetires.html
Wish someone made the Tiger Paws, but to no avail. As far as specs are concerned (what you're allowed to run,) it's best to get the F.A.S.T. site.