Links to a lot of good info about motorcycle oil filters, and automotive filters that can be cross-referenced to motorcycle applications...
http://www.calsci.com/motorcycleinfo/FilterXRef.html (http://www.calsci.com/motorcycleinfo/FilterXRef.html)
http://www.calsci.com/motorcycleinfo/Co ... OilFilters (http://www.calsci.com/motorcycleinfo/Consumables.html#OilFilters)