Can anyone tell me the difference between a support rod and a guide rod or are they the same thing? When I look under my car just behind the front wheels there is a large bushing with a bolt/rod coming out horizontally towards the front of the car. This bushing is worn out and needs to be changed but I don't know what to call it so I can buy it. I also need to know so I can do a search to find out how to do this project.

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1983 300SD
200000miles