Hunt around your neighborhood for a shop that knows what you are talking about, take your business there, could be a farm shop, NAPA knows about fittings, others, too. Take your fittings with you.

Might want to get yourself a proper tubing cutter and a flare/inverted flare tool( one device)

Ed

Last edited by EdPruss; 03/10/2021 1:05 AM.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.