I have some questions on the Wiper System on my 450. I have become very familiar with the "mechanicals" of it lately because the linkages that connect the wiper motor to the blades keep slipping off due to dry rotted/worn retainers. I have replaced these with closely matching rubber washers from Auto Parts stores but they only last a few days of wiper use before they wear out. Does anyone have an idea where to get a factory replacement of the these retainers? I've tried various venues online and most only have the blades or wiper motors which I do not need. Also on a US Spec 116, which side are the Wiper Blades supposed to be parked, driver or passenger? When I got the car they were on the passenger so I've kept them like that but have heard from a Mercedes Mech they should be on the drivers side when they are turned off. Thanks for any information.