While the engine is out, you might want to take a clean wire and flashlight and poke through the holes under the front oil filter block off plate to explore where they really go. One goes all the way through across the block to the other filter location.
The thing to remember is that dirty oil enters the outer ring of the filter and clean oil comes out of the center hollow bolt and enters the engine.
It has been a long time since I did my swap and I promptly forgot the oil path details. I may have been dog tired looking cross eyed at my engine late one night. But something made me turn this little piece that goes under the oil filter center bolt so I could sleep at night knowing clean oil flows when I turn the key.
I may be all wrong about the necessity of that plate.
I believe that I swapped the block off plate to the rear...(axle)....side without problem.
Kubota engineers should be spanked if one cannot simply swap the block off plate and relocate the oil filter.
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