I have a tie rod worn on the driver’s side. I just got this car for my daughter, so I ordered both tie rods, the center link and the steering damper from Pelican Parts. All the parts are Billstein. To my surprise, the parts are thinner and the tie rod ends and center link ends have lock nuts rather than castle nuts and cotter pins. Pelican could not see a diagram of the Mercedes OEM equivalent parts but advised that all replacement suspension components are being manufactured this way. I will take a trip to my local Mercedes parts counter to confirm this, but is this true and how reliable are the lock nuts vs the castle nuts? Had I just ordered tie rods they would not have mated up to the larger holes in the center link. There are no instructions so I have no idea what the torque specs are on the replacement parts if I decide to use them. It is a few years since I have done suspension work but I am more comfortable with castle nuts and cotter pins and i would prefer identical oem replacements if still availble. Any input on this is much appreciated. Thanks.