How to replace the engine and transmission mounts on my Merz C240 2002 model?
I brought to the dealer and they diagnosed that the mounts were collapsed
and the rear right axle seal was leaking! Any help please?

See W203 Wiki here under M272 engine. Pretty much the same for M112.

https://mbworld.org/wiki/index.php/W203

I can't help you with the front engine mounts or rear axle seal, but the rear transmission mount was pretty easy to replace. In addition to the service manual pages you can search for 'transmission mount diy' on this and other forums and you should find explicit instructions.

Front & rear are in the Wiki.

Thank you that's very helpful

We also cover how to remove the bottom plates etc. etc.

this might help too:
https://mbworld.org/forums/clk-class...or-mounts.html

https://mbworld.org/forums/clk-class...cabriolet.html

any idea how to remove the shock absorber of Merz c240 2002 model
I did remove the nut on the right but I don't know the left side if it is clock wise or counter clockwise
any help