Along the lugnut line of thought, I have seen many people put aftermarket wheels on their vehicle, but leave the spare a standard wheel. Some of the aftermarket rims used a "special" lugnut that will not tighten on a standard rim, and if they didn't keep the original lugs they were SOL when it came to putting on the spare. So if you get fancy aftermarked rims, be sure to keep a handfull of the factory lugnuts...