I will try
Each team in div 1 and 2 must have 2 Polish riders in top 5 and a U24 rider as well(any nationality but if Polish does not count towards the 2 minimum)
Each team at 6 and 7 (14/15) must be Polish U21
NB for the 2 German teams in Div 2 substitute Germany for Poland above.
No 8 and 16 can be any nationality but must be U23 and can replace any rides in the 1 to 5. If Polish and U21 they also can replace 6 and 7
Div 2 teams are allowed to name a " guest rider" in 2021 which can be from a higher league but must be U23