I think 8HA in Alice Springs was of a similar vintage, e.g. early 1970s.
But AM stations still cropped up in the late 70s and even 80s (commercial FM didn’t start until 1980 in the metros, much later elsewhere)
3MP, 2WS, 2JJ, 2CC, 5AA in the 1970s
3ZZ came and went in the late 1970s in Melbourne
Some even later arrivals came with 2CS Coffs Harbour (1985?) and 6MM Mandurah (1988)