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Like they said, just rub them now and they'll be fine. If you don't have any rub prepared, just toss one together. In a pinch a basic sugar/salt mixture will give you a little crust and seasoning. Add some chili powder, garlic and onion and some cayenne for heat and you're on the express bus to flavor town. ( to borrow a phrase from Guy Fieri)
The most important thing is the temperature and time. A lot of people smoke ribs with NOTHING ADDED. Just meat and smoke. Get the texture right and they'll be great no matter what.