Had to sacrifice the oil pan to get the bolt out, Dremeling the lug away to expose the shaft, little devil was still refusing to budge with only 5mm or so of meat at the top, unable to move left right to break corrosion as sump location dowels prevented that, only option was tap sump down, but this still did not work.
I was concerned this may snap bolt off in crankcase so out with the Dremel and a lugectomy ensued, once sump removed the bolt came out easy all the corrosion was shaft to location lug.
Secondhand Sump and new oil seals purchased noticed a difference in part number of the sump 2002-part number 11210-MBB-D40 earlier sumps different part number. So purchased a 2004 oil pan with that part number and same internal number as my sump.
