Well- I thought I'd update my helpful friends on this one.

Got the missing MB parts (ruber dampers and bellows/tubes), and they were installed last Wed. along with reversing the upside down top retention plates.

Big measurable difference. Car sways less, has more damping, less road shock, very noticeable. I'm pleased.

And the tech who did his work over again was telling me: these parts don't have anythingm to do with handling or road feel; just prevents car from bottoming out. What bull____!

Always, always make sure a job is done right - if you can obnserve and use some common sense. Parts are expensive; don't waste them with inept labor.