I got the spare shortly after buying the car and have carried it ever since just to ward off this type of emergency. Where we were in west virginia I was not able to find anything, new, used or anything that would fit the rear of a porsche.
When I go for my summer hike in the Rockies 4 hours drive from here in my 2001 Boxster base I take a couple of snow tires and leave the spare behind. If I bought a P car with runflat tires I would buy a spare tire at least...