https://www.rugbyleagueproject.org/seasons/nswrfl-1975/round-8/canterbury-vs-parramatta-eels/summary.html
CB: All players are as you have listed, only Garry Hughes cannot be seen in the video.
Parra: Back line correct. 10. Olling, 9. Higgs, 15. Gerard, 16. Williams, 12. McMartin, 13. O'Reilly. Gerard & Williams were late replacements. In your notes section, "John Quayle & Dennis Fitzgerald dropped out of the Parramatta team on Thursday and were replaced by Graham Olling & Geoff Gerrard."
Olling was already in the side, but Williams was added.
https://www.youtube.com/watch?v=5OMfuAbh58Y