For your 1962 Ford Thunderbird with the original MX transmission, the cooler line fittings you're looking for are 5/8-18 inverted flare with a tapered thread. These fittings are designed to provide a reliable seal and are compatible with your transmission cooler lines.
When changing the cooler lines from hard lines to hoses, make sure to use high-quality transmission cooler hoses that can handle the pressure and temperature requirements of your vehicle. Additionally, ensure that the hose clamps are properly tightened to prevent leaks and potential damage to the transmission.
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