No rule says you can't have multiple sets, either.
And change them depending on your mood or what type of event you're attending. For example, a scoop for a traditional hotrod look, a pair of converted stockers for a more "restored" look, or a pair of skulls for the October shows.
One thing I want to try is to make a scoop out of a rural newspaper box. I think it will work well with my Shiner Beer can coil cover.
regards,
Leon