Here's a step-by-step retrofit with good photos that may help. As already mentioned, the brackets are welded onto the mufflers & then attached to the chassis utilizing rubber isolators that dampen vibration & will tolerate movement. (forget about my mufflers - not trying to sell them to you - just showing the muffler assemblies & how everything works). Also, the actual hanger part we left attached to the chassis during all this - we just needed to be able to position the tabs onto the mufflers.
-Eric
Classic Chambered Exhaust Inc. - Cobra