Here's a link to the factory service manual instructions for removal and installation of the front struts. Although it may be possible to replace the strut mount without completely removing the strut or allowing the spring to extend (by means of the floor jack under the ball joint, with a chain through the spring), I think that you'll have a tough time replacing the mount with a jackstand under the control arm and the strut still bolted to the knuckle.
Anyway, read the attached link, and decide for yourself.
Steve.
http://mb.braingears.com/201_DISK1/PDF/10004.pdf