I had 4wd cossie rear calipers on mine & discs!

I got that kit off of a man called Clint! but I aint sure if he is stillalive as i dont use turbosport no more or rsoc!

I wouldnt have a clue who u would need to speak to about gettin st170 rears to fit! but if u wanna fit cossie rears then speak to Mike Rainbird!