That's the one, PCV breather facing driver's side front of tappet cover, snout to passenger side with hot box valve and small breather tube for auto choke air supply up underneath. 1974-5 HQ and HJ. LH Torana is different.
Not easy to find. I was lucky I have about 20 x aircleaners I picked up from an LPG converter 20+ years ago and there was one amongst them.
You could get away with a HX-HZ one too from memory but will need mods.