the 3 door rear arb will only fit the 3 door rear end as it's mounted way out
you can swap the stuff aorund at the back and weld new mounts on to make use of the later arb's but i don't think thats going to make much difference

if you want to get things rolling and start on the right tracks, you'll really want to be looking at things like adjustable tca's and compression struts along with the front mounted arb with drop links and stuff as well as adjustable top mounts and ocil overs, but then it's a lot of money and a bit of a shakey ride