I have a 06-07 Kubota M9540 HDC12 with hydraulic suttle shift and a LA 1353 front end loader. It devoleped a hydraulic fluid leak between the quick disconnect plates. The model number on quick disconnect is M1869. I called dealer here and according to them Kubota doesn't make or list a replacement O ring for the hydraulic couplers. I can't tell which side is leaking the tractor or front end loader side. Anyone here ever run into this problem????? Maybe shed some light on which way to start......Andy