As for reference to the triangulation of stock lower arms check out a local members build HERE
About 1/2 way down the page you will see a row of pictures that will show you in detail what this entails...
As far as the rear, you are talking about something totally different. A bridge bar is essentially a piece of 1"-1.5" round (preferably DOM tubing) that spans the distance between the notches. It would resemble something like this:
The lower tabs would attach to the axle...keep in mind there are many ways to setup shocks, but this is just the easiest way...