M5 Expert (>4000)
Join Date: Oct 2010
Location: Cobourg Ont
Thanked 1,968 Times in 1,652 Posts
Stick a long magnet all the way to the back of the motor. Things don't drop and stay. Can you clean and shot two more pics of the washer on white paper, one each side, need to see marks or damage on route to the pan.
Then take one more pic on the ruler but do it on the metric side of the ruler, it is German and all the specs are in MM.
When you are done all that look up at the oil pump. There are no marks from falling thru chains so it must have lived low, appears to be too big to fall thru a port in the head, sort of leaves oil pump, but not all parts of something show-up in realoem, because they are part of a unit and not sold separately.