I think we're describing the same thing. The links look reasonable to install if you're fairly accomplished as a DIY'er, though I had them done on my old 87 300E. I seem to remember that all 4 links on both sides were 1100 to 1400 installed at the dealer. I believe all the parts are just over 400 from this website, if you need them all.
(Oh man, this car is sooooo fast.)