Any hydraulic shop and a lot of the bigger NAPA stores can make up 3/16" or 1/4" flex lines in any length you want with swiveling 1/8" NPT male fittings on one or both ends that will attach to the engine block and the filter housing without adapters. They will be rated for a minimum of 3000 PSI without any leaks. It's usually called "single braid" line and it's used on all sorts of farm equipment and construction vehicles, etc.
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!