Couple of us have them on here. I went with the China clone 'Racor' base instead of the super expensive original RACOR, but the clone takes the Racor filter elements anyway. The Chinese clone is about 1/5th the cost of the Racor body. I bought a pair of IFJF bodies from the Amazon website. I have not changed the spin on engine mounted fuel filters or drained the sediment bowl since installing them as there is nothing in the sediment bowl at all so I also presume the spin on engine mount filter is also clean.
Nice thing about them is all you have to do is look in the clear bottom bowl to see what has been deposited in it and open the drain valve on the bowl and evacuate any debris or accumulated water. Mounted both mine on the FEL stationary upright and they aren't overly large either. Just so long as they are out of 'harm's' way, it's all good and simple hookup as well. Cut the fuel line from the fuel tank and fasten it to the supplied with the housing, barbed nipple and the other end goes on the other nipple. Hardest part for me was mounting the units. I used my Mag drill to drill and tap the mounting holes and I used stainless socket head capscrews to mount them. The bodies are supplied with a pair of barbed fittings and 2 blanking plugs as the bodies have a pair of inlet holes and a pair of outlet holes and the come with a port on the top so when I change the filters, I fill the now empty unit with clean diesel through the fill port on the top. That way I don't have to fiddle around with bleeding the injection system at all. Real simple install and candidly, I only change out the spin on filters every spring and not sure I even need to do that actually. I may add a pair of pressure gages in the blanking holes to monitor pressure drop at some point.
I was looking at the new common rail Kubota tractors the other day and I see Kubota has added fuel polishing filters to them. However, they are solid spin on filters with no clear bowls on the bottom and I checked with Kubota to see what micron rating they are and found out they are 10 micron. You can get the Racor elements at 5 micron. The finer pass the better far as I'm concerned.