Guys, guys...... all top guesses but not the one I'm after.
Round head lights were in models before and after HK and XA
I think seat belts were mandatory before HK era????
Probably only offered front discs back then.
Twin head lights and T-bar are worthy guesses but no cigar.
Ah yes the TEN brand push button radio and good ol RTS (BS) - not introduced on HK
Brand new floor pan - good guess but not right.
I'll give a hint...
Its to do with the sedans and wagons.... the similarity that changed from HK onwards to the present day, and from the XA onwards to the current day.
KEEP ON TRYING - YOU'LL GET IT!!!!