Hi David,
They look like the big letter goodyear tyres . I believe these are a race only tyre and don't have a DOT rating. it hasn't stopped a bunch off the guys in the US running them.
They are big wide and sticky and from what I've read have a tendancy to make the steering hunt a bit. They really throw rocks around as well with the sticky rubber and the tread pattern they have. If you want to run them you could probably get a set shipped over from the US. I believe a few specialty rubber supliers carry them.
Check out Roger Kraus Racing:
Cobra Tires
Cheers