Apologies for resurrecting an ancient post, but this was extremely useful in working on my 2000 C280. Thanks, Glenmore!

I initially tried working on the drivers side by removing the ac compressor, and couldn’t get the mount out the front so I’ll be trying your approach tonight for the rear removal and will report back.

On the passenger side, one tip I found useful for replacing the alternator was to spray the bushings with penetrating oil, wait, and then grasp them with with pliers and ease them forward (towards the radiator) with a twisting back and forth motion. This was easy on the top bushing, though more of a challenge on the bottom one. It was much easier to pop the radiator back in, and the process of torquing down the bolts moved the bushings back into the right spot.

Fingers crossed I can finagle the mount out the rear - thanks so much for this great write-up.