The lcr rears are just normal calipers. But they 256mm vented discs as apposed to the 232mm solid discs we get as standard. I got the hoses from demon tweeks, cant remember how much they were but I got fronts and rears.
That kit you linked is just a rebuild kit, body bolts, shim bolts and the link pipe that goes between the 2 halfs of the caliper. Is it the solid section of pipe that comes out of the back of the caliper that you're after? Think you might have to go to the dealers for that.