As far as I'm aware, none of the Australian delivered AE86's ever came with an EFI tank set-up given that they all had the 4AC motors (ca-bu-rated) bar a couple that were brought over for race purposes only.
Only the higher spec overseas models from America (ie. GTS) or from Japan (ie. GT Apex) with the blue top motor would have such a tank.
Best bet is to get an AE82 tank from a twin cam engine and see if that fits.