an interesting point:

an interesting point: When NASCAR officials decided to disallow Jerry Nadeau’s qualifying time yesterday, it raised an interesting question. With the Winston Cup series having only one round of qualifying the rest of the season, what happens if an unapproved part is found? According to NASCAR, drivers no longer have to post an official qualifying time to use a provisional, they only have to practice. So a driver could have a penalty on a qualifying issue but still have access to one of the seven provisionals for the race(Richmond Times Dispatch)(2-11-2001)