Marty, I can't be sure but with this plastic hose it usually has a hollow ferrel up the inside to prevent it squeezing in and then an olive over the outside that compresses between the nut and the fitting it fastens to. Mine are tiny, 4mm OD tube so I bought original tube and fittings from Evektor in Europe just because I had other parts coming.
If I need anything tubular air and hydraulic I think Coupler's in Malaga, WA are as good as any place to get this sort of thing. I just went there with the brake fittings off Ripper, my 1980 grader. IT took them about two hours to replicate the flexible hoses that were imperial thread and they supplied all the tube and tube nuts at the same time. Pretty much blew the budget but I got exactly what I needed.
https://couplers.com.au/