just bought a 1979 300sd. a mercedes mechanic told me all i needed was new shocks. so now i have a smooth ride to accompany the clunking noise i hear at low speeds when i go over bumps. the mechanic had it up on a hoist and couldn't exactly pinpoint the problem by tugging on stuff. though, there are two sets of bushings (one set on each side of the car) in close proximity to each other that look worn. are these my upper and lower control arm bushings? he said i'm looking at ~$400 to replace them. (i only paid $1,200 for the car!) should i just find the parts somewhere and have pep boys install them?
thanks.