I am surprised that these links have not appeared yet. While just one website's thoughts on oil filters, there is a lot of information that is interesting and possibly helpful.
They took some filters apart:
How filters filter (or fail to filter):
And cross reference listings for motorcycles:
They took some filters apart:
Motorcycle Info and Accessories
motorcycleinfo.calsci.com
How filters filter (or fail to filter):
Motorcycle Oil Filters and Air Filters
motorcycleinfo.calsci.com
And cross reference listings for motorcycles:
Oil Filter Cross Reference
motorcycleinfo.calsci.com