Speedo gear

I'm running a 904 from a Cordoba and 8 3/4 rear differential with 3.55 gear ratio and I need the correct color gear drive to use in my 65 Plymouth barracuda fastback gasser project. I have a black gear drive but I think someone mentioned I need a red gear drive. My tires are 27 inches
pic are on general discussion on off topic forums
also need orings for it and the shaft that slides into center hole that goes up into plastic gear

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What do you have for a cable? Those later styles used a clip on connection to the speedo head. Your '65 Barracuda should have a screw on type. Some hybrid you had made?