James,
I suspect you are already aware that the Six engines from 37-39 were sold with optional filter that bolted onto the lower left front area of the block. In 1940, Packard introduced a more generic, but still Packard specific design that bolted to two tapped holes on the engine head. If you choose to add something back, you would need a simple bracket that will attach to the head.
Examples of placement of the later version shown in Packard literature images below, for different years. For more detail, you can review the model year catalog literature on this site. Great resources.
Although my mileage is also low each year, I prefer to use a filter since the majority of oil contamination occurs during engine start and warm up. Lots of short trips are worse than few long ones, for the oil. My automotive engineering background also led me to this as a no brainer.
However, it is your car and of course, your decision.
Pat
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