That one's an oddball fitting that most places stopped stocking many years ago. I have substituted for it by purchasing a 1/8" pipe to 3/16" tubing compression fitting, and drilling it out so the tube will slide all the way through it. Slip it over the tube before you bend it to shape, and screw the pipe threaded end into the block with a little brush-on Permatex on the thread. Then slide the compression ferrule and nut over the tube, tighten it, and bend the tube to shape to fit the oil distributor.
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!