I ran three filters on the racer. Of course, they are not lovely pieces like Vincent makes, but they do the job.
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The stock one, the spin-on and there is a pre-filter that is between the silencer and the ufm. The pre-filter looks like this:
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It has a magnet and a wire screen. With filtered oil going into the tank it should be clean, but the pre-filter is a good backup in case anything falls into the oil tank (or flakes off).
The spin-on filter is the RGM Norton remote filter, but in the States, the filter itself is available from NAPA.
David