There are two plaques that came on my car. I have a '73/'74 TC Special but I expect these plaques were on the '72 also. The first one was found on the inside of the front trunk on the forward wall (so it faces toward the cabin). The emission plaque was found in the engine compartment. I've made changes in my car so I don't remember exactly where it was but I think it was above the boosters on the driver's side. In addition, r.d. enterprises sells a 'Federal Conformity Label' and a 'TwinCam Stromberg Airbox Label'. I don't remember those, but then that was a long time ago...
I don't know if the plaques are available any more, but Dave Bean has a lot of vintage stuff so you might give him a call if you need either of those.