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I have been saying for years to use a Motorcraft FL 400s in place of the FL 1 a. From Bobs the oil guy; FL1, 5.190 high - 3.78 dia. - FL400s, 4.14 high - 2.98 OD. They both have about the same specs for anti drain back, and micron filtering media. If someone needs a really short filter, the 910s is only 3.36 high, and 3.15 OD. It filters to 35 microns while the other two filter to 20 microns. The reliability of most Ford oil systems tell me to use what fits best. On my 55 sedan, the FL400 fits so much easier between the steering linkage and all the other crap in the way it made oil changes a please rather that a chore.