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Mark A probably has a few of those fittings he could sell you.
The nuts are still available from Toyota as are the olives (compression sleeve for the hard lines NOT the soft lines). The soft line nipple has no part # that I have ever found.
Nut: 90402-13041 (3/69 - 7/80)
Olive: 96395-71400 (3/69 - 7/80)
The nuts are M13x1.5 and are only available from Toyota far as I know. The nut is used on all carb inlet fittings, some fuel filters and some fuel pumps. Same nut is also used on emissions equipped 2F AIR injection rails, so if you've desmogged and have a rail laying about, there's 6 spare nuts for the stash.