Speedometer cable question....

I came across this one day, it's a ratio adapter that was used because there's only 6 different speedo pinions for pre-'66. There are different ratios, so maybe one of these and the correct gear count pinion would work? I've never had one, not even sure if a newer cable would screw on. Gonna be $$ though... The lower unit in the picture is the normal one, just with the cable lopped off.

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