YES, you can get a kit to seal the struts- email me for the source if Fastlane doesn't sell it. It's very inexpensive. Contrary to public opinion, these systems are not much trouble if you have basic understanding and know where to access parts reasonable.

I have 6 liters of proper MB fluid made by Bilstein you can have at my cost. Didn't mean to do an infomercial but help and cheap parts are hard to come by in my experience so glad to help.

Also, if you wish to email me, I can give you expert advice on hydraulic suspension since I've worked on mine for 8+ years. ( I even have a manual translated from German to help in diagnosing if needed).