I've got a late 70's M416 with the original surge brake system. My problem is that the system has been dry for years and I don't have any information on where to source a kit or rebuilt master cylinder for it. Anybody have a source? Also, mine was converted to a standard 2" ball style hitch by a P.O. and I would like to go back to a lunette style hitch. Anybody have one they would want to sell?