is this the right gearbox ???
 

HI THERE , I OWN A 1999 WRX STI TYPE RA V-LIMITED, ITS GOT A 5 SPEED WITH THE SERIAL NUMBER TY754VB1EA AND ITS GOT THE LARGER REAR BRAKE DRUMS ! I AM LOOKING TO BUY A 2004 VERSION 8 6 SPEED WITH DCCD ITS A JAP BOX OFF A V-LIMITED MODEL WITH THE SERIAL NUMBER D3-TY856WB4KA .
WHAT DIFF DO I HAVE ? I HAVE MEASURED THE BOLTS ON THE DIFF ITS 80 MM FROM THE CENTER TO THE CENTER OF THE HEAD OF EACH BOLT , OR 65 MM INBETWEEN THE HEADS OF THE BOLTS ! (THE DIFF IS 500 MM LONG ) SO DO I HAVE A R 180 DIFF OR A R 160 ?
WHAT WILL I NEED TO FIT THIS GEARBOX FROM THE VERSION 8 STI , SHAFTS ? HUBS ?
HOPE SOMEONE CAN HELP ?