For a Rugby World Cup squad, teams are allowed to select 33 players in total.
Out of these: Typically 14 players are backs (backline players)
Based on current form this could be the backs for the next world cup. It is 15 players, so Delande would probably have to be dropped.
Pead could be the bolter who squeezes into the squad. Might be enough time to find another outside centre to replace Kriel.
9. Williams / Faff / Haashim Pead (bolter)
10. Sasha / Libbok / Pollard
12. Willemse / Esterhuizen / (Delande)
13. Moodie / Kriel /
14. Kolbe / Edwill van der Merwe
15. Aphelele Fassi
11. Ardense / Hooker
Usually, squads will include about six half-backs (3 scrum-halves and 3 fly-halves) and the remaining backs cover centres, wings, and fullbacks. Versatility is often considered, with some backs capable of playing multiple positions to maximize squad coverage.