HQ Chev is def 5 row. As far as I am aware Holden V8 is 2 row (thinner style), and Holden V8 heavy duty or with A/C or V8 cab-chassis are similar thickness as the 2 row but 3 rows. Later HQ parts catalogues show the 3 row like a HJ-HZ with the thicker tanks for V8 or 6cyl heavy duty or with A/C or with cab-chassis or something like that.
Your 60mm thick one will be a HJ-HZ A/C V8 or V8 heavy duty (or 6cyl heavy duty with A/C eg taxi if outlets opposite).