300E motor mount replacement

[shindig]

I opened the hood on my mint 1988 300E last night and found a brown powdery material all over the passenger-side motor mount and crossmember -- it looks like I'll have to replace both mounts this weekend. Any tips or tricks? I've seen other posts that refer to tons of information on replacing the motor mounts, but I haven't been able to find anything.

I'm planning to order the new mounts from FastLane, and replace them in my driveway. Any suggestions or tips would be appreciated!

Thanks for your help.