2021/2019 IJSBA sport gp rules - displacement

[88kawi5fiddy]

Uhh.. seeing as there never was a 2020 nor 2021 rulebook i can find, the displacement is never mentioned for sport gp in 4 stroke or 2 strokes, other than the 8 psi for sub 900cc and 6 psi for sub 1100cc engines.

So whats the displacement now?