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Nut: 90402-13041 (3/69 - 7/80)
Olive: 96395-71400 (3/69 - 7/80)
The olives are 5/16" compression sleeves, available anywhere.
From Jim C.: The nuts are M13x1.5 and only available from Toyota. The nut is used on all carb inlet fittings all years (not just 69-80 as the EPC reports.) Same nut is also used on AIR injection rail, so if you've desmogged and have a rail laying about, there's 6 spare nuts for the stash.