BBC Speed and Machine still sell them. $1235 shipped.
They are super easy to install. Just remove the rear wheels and two large bolts (19mm if I recall) and one 7mm bolt will remove them, then replace.
You'll need to immediately get an alignment though, as your camber is going to be seriously off after installing these. I tried to eyeball it and got dead on with one side, but was really off on the other side.
Takes about 20 minutes a side if you know what you're doing. Otherwise, budget about 1.5 hours.
So set rear camber at -1 and total toe around 0.15 is that the ideal to help with tire wear?