Automatic Transmission Fluid for (3 speed) 67 Cougar XR7 (390)

Hello Guys,
I’m just working on my 1967 XR7 after it’s been garaged for 5 years I had to remove the radiator, so disconnected the hydraulic transmission cooling lines. I’ll need to top up the automatic transmission fluid but want make sure I use the correct stuff. The current fluid is definitely red. Could you let me know the best one to buy that will blend with the current fluid. Cheers…Les

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Thanks Gah,
I found some locally, so I’m in good shape.