martin the 2wd 4 pots will need some sort of bracket to fit to S2

the disc on a 2wd are 283 but 278 on the 4wd serria/escort hence why everyone uses the 2wds

the st170 set up is the same caliper as the escort cossie but the carrier bracket is different and will allow it to take a 300mm disc. again this is a staright bolt on (couple of washers to position it)

the 4pot 2wd caliper is the only one that needs bracket made for it