Mate the GT was not officialy released in Australia. I am led to beleive they imported 6 or 7 GT's the rest were Private Imports.
The GT rims however are available over here as they were fitted to some T-18's
LT & ST received 4 1/2 " wide Steel rims with 165 SR 13" Tyres (These are 82 Profile tires) Depending on the country of release the GT received the 165 SR tires or a 185/70 13" Tyre on a 5" wide rim.