https://www.rugbyleagueproject.org/seasons/nswrfl-1983/round-22/easts-vs-newtown-jets/summary.html
Easts: 20. I think it's Russel Gartner seen just before Ferguson try (see 1:05 & 1:10), 30. unknown (see 42 & 54 sec)
Newt: 15. I am guessing it's Lance Thompson looking at the Newtown BL pin-up for 1983. (see 57 sec with try assist to Ellis, 17. Ron Sigsworth (see 38 sec & 1:07) 25. Craig Ellis (see 47 & 54 sec & 57 sec scoring try)
https://www.youtube.com/watch?v=UBhk5q8kggk
Having just looked at the footage myself. I do have no doubts. That No. 20 for Eastern Suburbs in this game. Is Russel Gartner.