A little off topic but this is also why I make sure I use a KUBOTA brand hydraulic filter. I had no luck trying to find a sutable cross to a baldwin or hastings etc., not to mention most dont have the magnets. I dont use the engine oil filter from kubota. It is a common size and thread that can be crossed to any filter mfg of choice. IMO, a better quality engine oil filter can be had for less $$$ outside of a kubota dealership, but that is not the case with the hydraulic filter.
I even took the old magnet from my old hydraulic and stuck on the outside of the engine oil fiter for added peice of mind.