Car is a 1999 clk 320; steering assembly/drag link (one piece includes both tie rods and center drag link) was replaced about 5 years ago with oem part; idler arm has never been serviced. Just got new tires because old ones were badly worn on inside and outside edges. Took the car to dealer for alignment. Wife was told first to replace steering links (drag link assembly & idler arm bushing), steering shock, and stabilizer bar bushings, for total of $1250. Wow!! Got a second opinion today from the indie I use - he said to replace only the steering assembly and steering shock. From my search, a worn idler arm bushing contributes to uneven tire wear. Should I have the idler arm bushing replaced as preventive maintenance? Is the idler bushing job easier or less expensive if the drag link is done at the same time? Thanks.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)