Have you opened it up? I'm going to guess the hole that's offset to one side is the inlet, and supplies oil to the outside of the filter element, and the return line will come out of the center. There's probably a small hole somewhere in the center pipe that acts as a restrictor to prevent oil pressure loss and control the flow through the filter. Finding a correct-sized filter element might be a challenge.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!