I found it in the HZ features manual.

Ute or van was available with options F72, XW5 or FE7 which all got you cab-chassis rear springs.

F72 was called "Gross Load Equipment" or "Gross Load Package". Not sure what this means exactly, I thought it may mean something like a slide on camper but it also appears to be available on sedans, wagons and statesmans (except you got heavier rear coils on these). Possibly it still means any vehicle application where a permanent gross load was to be fitted?

XW5 was the "Outback Equipment Package" another special vehicle package like BO6, XU3, XX7, XU4, B47 or XY7. This package included F72 amongst other bits like mud flaps and heavy duty aircleaner (this was the only instance of factory fitted mudflaps).

FE7 was "front and rear heavy duty suspension". In addition to the tonner leafs this got you V8 tonner front springs as well.


HX looks similar except all V8 commercials got the same front springs. Not sure about HQ and HJ as yet. WB should be the same as HZ.