Are you sure those parts need replacement? Maybe a second opinion is needed. At that low mileage I'd be surprised if all those parts needed replacement. The belt probably and the tensioner, maybe. I've never had any make of car, even Ford, require that much front end work at that mileage.
My '86 300E, with 160,000 miles, still has all the original front steering parts in good shape with only the damper replaced. The tensioner is original too. I'd hope that the durability of the MB hasn't gotten that much worse.
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1986 300E
1993 Volvo 940 Wagon
1984 Volvo 240 (daughter's)
1976 Dodge 1/2T pickup, gas hog