My front hydraulic couplers are leaking while connected. I replaced the O-rings a while back but couldn't remember the part number so I looked it up. The parts manual shows the O-ring R26448 but also shows a washer M44079. I don't recall having this washer inside mine. The sub number 32246 is the same for both parts. So is (or was) there supposed to be 2 O-rings as indicated by the old sub number? The washer is rubber too. I was expecting it to be Teflon.