I have a rear end from third gen with drums looking to convert to disc, what's needed and were to buy it . Any help would be appreciated.

 

There is a search function that should find you some threads. You could also try looking at the conversion kits flynbye.com has. They're not real cheap but it should be one stop shopping for which set up you decide to go for. You need a bracket that bolts to the axle tube to hold the caliper bracket, calipers, rotors, redo a couple brake lines and emergency brake etc. If you look at the flange on your axle you'll see how the conversion bracket on flynbye fits.