You've probably resolved this by now but if not, most any Clark dealer can either rebuild it or point you in the right direction. Unless you somehow got one of the original test bed Unimogs that were assigned to 9th ID's High Technology Test Bed it's likely that you have one of the type classified production models. Those have the Unimog chassis and the rest was provided by Clark. While still under warranty we went through Freightliner but after the warranty expired we went directly to a local forklift shop that was a Clark dealer and 9 out of 10 times they had all the seals packings, and wipers right there. We repacked the cylinders all the time and seldom had to do any chrome repair or anything other than a bit of polishing with some crocus cloth.