I've been driving on a set of these pin drive wheels on a 67 Mustang for over a decade. I love 'em, but DON'T MAKE THE SAME MISTAKE THAT I MADE. ORDER 5, NOT 4.
Today I'm finally ordering a spare. Once you convert your car to pin drive wheels, the car will not accept a regular lug wheel. Also be aware that Discount Tire will happily sell you tires and mount them on these wheels but will not install them on your car. They site "liability issues" (which are totally mitigated with a twisted wire placed around one of the "spokes" of the wheel and drill a little hole on the spinner to loop the wire thru, then spin twist the wire and you're done. (I've found using a thin black nylon zip tie does the trick cheaper and faster).

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