It looks like the split coupling is a 3/4-inch and the blue one is 1-inch. I think you must have a reduction gear in your vee-drive, so that would be a larger diameter prop, thus a 1-inch shaft.
I think you should sell the split coupling to an a4 owner with 3/4=inch prop shaft (Catalina ?) owner and buy the right part.
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Whiskeyjack a '68 Columbia 36 rebuilt A-4 with 2:1
"Since when is napping doing nothing?"
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