If you are doing a front and rear 4 link you need a nice, strong cradle. The cradle is what ties the links to the frame. These angles need to be set up correctly. Without a proper cradle you can suffer from poop ride quality, binding links, colliding links, poor pinion angle, driveline vibrations, and worst of all an unsafe vehicle to be driven.
Your cradle will be custom designed for you and your build. I will work with you personally to help get the right angles to make sure you have your build setup properly.
The price of the cradle may change if the OUTER face is larger than 15"x24"