Hello Gromit, I missed this thread, sorry.
My Tallulah is a 1971 Series 3 Wagon. It does have the heater fan in the left wing, fed from a grille on the side, and it also does not have anti burst doors. I'm pretty sure it was imported privately from the UK, and not sold as new in Australia.
I've never seen a heater like the one you have there, very odd!
Cheers, Mike.

