The 5/16" hose should be easy and the 1/4 bsp nuts and tails are available from firms like Green spark plug co, Vintage Supplies, and probably Ebay. Then hunt down brass ferrules.(I might have some?) Not sure if those exact hose clips are available or have to be made, or what crimping tool is required to give that same effect...... Stuart Bray did have some complete NOS oil lines.
Yep I made mine and I think the ferrules where some that you machined to length Ian. I never bothered crimping them, I used hose that was a good fit on the tube and squeezed the ferrules on with a dab of silicon sealer. They've never leaked in all these years. Ron