1978 GMC k15, 4x4, chevy 350 with NP203 xfer case.  
I can buy a set of transmission mounts, complete with metal, or I can buy mounts, less the metal.  The metal I speak is a steel sleeve and also a "C" looking piece of metal.  The "C" shaped piece of metal holds a mount that I cannot separate.  It appears to be glued to the metal.  The replacement set with the metal comes separate and is assembled prior to installation.  How do I separate the "C" shaped metal from the rubber on my old one ?  I don't really need the more expensive set pictured below. It shows you the "C" shaped piece of metal I speak.
I have been told to use a torch...is this the best way. any other suggestions ?