Except that I have never seen an Aussie sold one. The 'custom' was sold in the US and Japan but with no back seat. The cars sold in Australia that I have owned have been 4 seat cars, that my 6,1 frame could not sit in the back of. Series 1 had steel wheels and A/C was an option but S2 all had a/c and alloy wheels. And ofcourse in Oz they all had 12A engines.
The Porkers in the 60s would have had only marginal more rear seat room.
As David says somewhat suss meaurements. I would sooner fit my head in the back of an 850 mini than a RX7 or Porsche. Cortinas never ran AppJ but were a 4 seat car undoubtedly. As were Impalas and Galaxies which were true 6 seat cars
Trust me Lee, there were two Series 1 models sold in Australia. The DeLuxe with alloy wheels, air-con, etc and in much smaller numbers, the Custom with steel wheels and the different seats, notably in the rear.
Our first RX7 run at 1979 Bathurst for myself and Terry Shiel was built from a brand new Custom. It was the second RX7 race car in the country after the Precinct Performance car from Newcastle that Dean Gall co-drove (can't remember the owner's name), which debuted at '79 Sandown, IIRC.
Anyway, when I (179cm) sat in the rear of ours my head was not touching the roof lining, however if I bounced a little I 'bottomed out' so to speak as there was little padding in the squab, which was also very bucket-shaped. I recall we even measured the height to confirm that it was indeed technically a touring car, even if not a practical 4-seater unless the rear occupants weighed less than 30kgs. Of course, that fact didn't prevent us copping a lot of flack at Bathurst that year for racing a 'sports' car!