Well, certainly don't know what the NAPA guy showed you, but on the complete unit the end that hooks to the transaxle is female and pinned through the housing into the shaft coming out from the tranny.
I only add that last part because I saw this bizarre Ebay add wherein the guy claimed the only thing wrong with the car was some "mechanic" tried to take the axles off without removing the pins, damaging the transaxle.
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