I've decided to fix the slightly sagging rear end of my '88 420SEL. I'm replacing both OEM rear springs, and my question is: is there anything else I should replace as well? I'm pretty sure the shocks don't need to be replaced, but is there any reason to replace the front springs? I haven't had any problems with anything, but I wanted to make sure that there aren't any components that should be replaced along with the springs.

Thanks for any help.