Straight from the horses mouth(NHRA Tech GUY Danny Gracia) ALL TTOP CARS ARE NOW CONSIDERED OPEN COCKPITS. This means we have to follow the same rules as convertibles.
13.99 needs a rollbar and 10.99 needs a roll cage. Also if any car has a roll bar etc. then you MUST have a 5pt harness. Stock seat belts are not legal.

I dont agree and have been arguing all week with NHRA about this but I'm just a small chassis shop so I have no pull.

The new rule revision will be publisised in the National Dragster soon.