Jegs sells a full conversion kit. I believe it has everything you need. $600-650
But, is it worth it to you? Considering the rear only does 30% or so of the braking and you're adding about 30% to the performance of that, for the same or less you do a dual piston upgrade to the front of your truck is older than 2000 and you'd get better results from that. For disc rears, roughly a 8-10% increase in overall braking. You can get better from upgrading the front and just running a larger cylinder in the rear