Went to Wal-mart, aside from making 107% profit on 1.5 year old Motorcraft oil, I found out that an FL1A will mount to the filter head.
Now, it gets difficult
See if you can follow me. In Japan, the filter for my car is the same for the 2.5L that comes in the Mazda Millenia and a whole lot of other cars there.
Check the filter here, and it is the same as my bike, and other vehicles. I have 10 filters for it ID is 2.173 OD is 2.475 Bypass is 8-11
The adapter runs an FL1A thread, and the mount is 2.1875 ID and 3.0 OD. I can't remember how much room there is around the filter, so I don't know how much wider a filter I can use. I know that i have 19 cm from mount to metal support under the car, so I need to limit mount and filter to 18.9999 cm. Mount comes to 4.1 cm, so I have about 15 cm to play with for a filter.
So, here is where I am. Take the adapter, MG, and 1 7317 back to Japan, if I can, run it, mount MG, check clearances, then, when my parents come, have them bring me whatever filter I decide I can run with the FL1A size.