I've got 2WD Cossie calipers and discs on my ERST, bought them off Ryan, he had them modded as well so they fitted straight on

The 2WD discs and 4x4 calipers will fit straight on, the only mod you may need is a 1mm washer to space the caliper on the disc properly, you don't need any brackets.

Heres another link for ya

http://users.turbosport.co.uk/cossieclint/index.html