rear bushing problem
 

i just bought a 93 500sel and when i get into the car the rear left squeaks it gets worse and annoying when i am driving at low speeds like in parking lots it has the self leveling suspension
i had it checked out by a suspension shop (30 miles form my home) and they told me that it is a bushing
the sway arm bushing

i went to the dealer to get a price but they said that the sawy arm dosent have a bushing

and then the dealer starting showing me a list of the bushings that they have for the rear suspension

does anybody have an idea of what the problem is or what bushing it could be

- 122k miles

thanks