http://supertaikyu.com/races/round1/..._entrylist.pdf
Entry list for Round 1 on April 1-2 at Motegi. It's two 3 hour 20 minute races that weekend.
Group 1 - 33 cars
ST-X - 8 cars
ST-3 - 9 cars
ST-4 - 16 cars
Group 2 - 24 cars
ST-R - 4 cars
ST-1 - 2 cars
ST-2 - 5 cars
ST-5 - 13 cars