Got the scat gold big mouth but no fitting instructions where do all the small seals fit and there's 2 different sized black metal rings ?

Got the scat gold big mouth but no fitting instructions where do all the small seals fit and there's 2 different sized black metal rings ?

Sussed it with some Internet searching even an explanation about the metal rings being pressed so they have a bowed look and a slightly ragged edge so ragged edge towards seal so it has a better fit.