Just in case it helps anyone: I got a Chinese ebay pump for my M5400 and I finally got to mount it today. It wasn't an exact fit, the bolt pattern on one of the exit lines was wrong also all the suction line bolt holes had to be enlarged, thank God the flanges on the lines are aluminium and it was easy to drill. Still a lot of aggravation due to the limited access. Also the face plate is too thick... But got it done eventually. And the hydraulics worked right off the get go. Will see how long it lasts. It was $320 shipped which was hard to say no vs $1700 on messicks.