Hmmmmm. Is there any chance you can post a picture of the pieces you are refering to? There are a few cougar specific only vendors, like west coast classic, or Johns Cougar. http://www.johnsclassiccougars.com/
As I understand your description, these are an engine and transmission mount, as well as leaf spring isloators. "Common" rubber parts...(Stateside, anyway....)
The bracket is shown in the photo I posted. It's the steel shell going up the sides and over the top of the rubber bushings, with the flange on the U bolts at each side. Be aware, using these insulators will lower the car about 1/2"