used ? from a junkyard, but it may very well be at least as bad as what you have now.
I'd go new Mercedes parts only if you want to keep this car. sign up for the EPC (Electronic Parts Catalog) from http://epc.startekinfo.com/ its free for Americans, but they want a credit card number to verify you are in fact American. Clue: use visa/mastercard, it says it takes AMEX, but always fails with cryptic web errors. Anyways, the EPC will take your VIN number, then give you the complete and detailed parts catalog.
I suspect you are describing the anti-sway bar but its hard to say from your description.
I'd go new Mercedes parts only if you want to keep this car. sign up for the EPC (Electronic Parts Catalog) from http://epc.startekinfo.com/ its free for Americans, but they want a credit card number to verify you are in fact American. Clue: use visa/mastercard, it says it takes AMEX, but always fails with cryptic web errors. Anyways, the EPC will take your VIN number, then give you the complete and detailed parts catalog.
I suspect you are describing the anti-sway bar but its hard to say from your description.