The full flow filter on the 261 uses 1/2" NPT fittings (1/2" pipe), and corresponding size flex hoses. Most aftermarket spin-on filter adapters also use 1/2" pipe fittings. Any hydraulic shop should be able to make up a suitable set of lines- - -just be sure the hoses are rated for hot engine oil, 250 degrees F. minimum. I'd suggest a teflon-lined hose.
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!