I found that one of the lock lugnuts on my wifes 98 Firebird was starting to strip. So I was like well I'll replace it with a new one. I called Pontiac and told them I needed just 1. The guy was like ok lets see....he goes hmmm...it will be cheaper if you buy the whole set (4 (1 for each wheel) + the key). So I ended up pay $60 for the stupid set and that was cheaper than buying just 1. It doesn't make sense to me either.