you could always just use the stock 1200 rear brakes,because too big a rear brake will lock up,particularly in a ute.just change the 1200 backing plate over to the other housing,the spacing on most datsun diff housings are the same,then you'll probably have to get the centre of the 1200 drum machined out to clear the axle.i had to do this in a 1200 coupe with a c20 van h165 diff.or you could try discs from a bluebird or a pintara.also,please fill in the details on you avatar,because you might not be able to get these parts,say if you're in new zealand or america.