https://www.rugbyleagueproject.org/seasons/nswrfl-1983/round-26/easts-vs-south-sydney-rabbitohs/summary.html
ES: 1-8 are correct, no. 13 is Terry Regan (see 6 sec), no. 20 is James Cutler by default (see 1:32), no. 27 is Dale Garrett as he scores a try (see 1:11 & 1:46)
Somebody else may be able to check the rest of the Easts forward pack as Regan is definitely wearing 13 & not 10.
The Easts team had a few changes Gurr who was bracketed with Mick Ryan in the centre both were listed in #3, Graeme Atkins was selected at fullback in #1 with Ian Barkley #5. In the forwards Matt Cruickshank & Shamus O'Connell were bracketed in the 2nd row both in #10 neither played, Terry Regan was selected at prop in #13 moved to the 2nd row and Robert Cowie came into the team.
Marty Gurr appears to be in #5 when he takes the bomb at the 0:06 mark, Graeme Atkins in #1 you can see him at the 1:26 mark when Pobjie scores and Robert Cowie appears to be in #10.
So numbering should as it appears now https://www.rugbyleagueproject.org/seasons/nswrfl-1983/round-26/easts-vs-south-sydney-rabbitohs/summary.html