I own a 73 series that will shortly be sold because it is hard getting my 3 kids in the back. very good vehicle off road but have bit the bullet and got a diesel 80 series.
anyway, all 73/74 series in aus have rear seat belts, lap and sash for sides and lap belt only for middle. the rear seat (in mine anyaway) is awesome flat bench seat with more room and easier to fit car seats to than any other car ive come across including the 80. this is because of the flat bench style. prob not so good later on or for adults for comfort.
to get kids in meant elder of the 3 climbing between front seats herself and then we buckle her in, and 2 younger ones slide passenger seat back and half climbing in with them, or putting kids in thru side windows. not easy when car is 2" spring, 2" bl and 35" claws. but you do what you have to do
my advice is get an 80 series, the coils are heaps better for the ride esp when carting kids around alot. and better off road. i wouldn't buy a 60 series even if it was free, but that's just me