I already broke a steel shock mount on my 8ight if that helps. You wont save much weight by switching to carbon fiber, maybe 1/2 an ounce even if it is assumed that the carbon fiber mounts have zero mass. Are you sure do don't mean shock towers? Shock towers are the most vulnerable part of a buggy. I wouldn't change them if I were you.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy