Any belts are OK to 11.49. Faster than that, the belts must be certified/dated.
Wasn't true for me but that was some years ago and in NY. I was told by the inspector a factory belt, or dated improvement. At the time I had racing buckets and older 5 pts from a race car I parted out. I was running in the 12s at the time. It cost me a day and towing. Went back with stock lap belts in the factory holes and was cleared to race.
