727 Automatic coolant line Fitting

These are common ordinary brass adapters, and EVERY parts store should have them. The transmission will normally be pipe X SAE flare, and the radiator end will normally be either SAE flare or inverted flare just like your brake tubes

https://www.parker.com/literature/F...ectors Group Static Files/G-BrassFittings.pdf

These are "called out" by the tube size and pipe size, so, say, 5/16 flare x 1/8 pipe ............see page 15, above, 48Fx5x2

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