Conversation so far:
When was the 1973 National 500 held?
The 1973 National 500 was held October 7, 1973 at Charlotte Motor Speedway in Concord, North Carolina.
Did Bobby Allison do well in the National 500?
The first three cars to cross the finish line after the scheduled 334 laps were driven by Cale Yarborough, Richard Petty, and Bobby Allison, in that order.
What happened with Bobby Allison after the National 500?
Following his victory at Daytona, Bobby Allison's car was inspected and was found to have lost its rear bumper, causing a multi-car accident.

Question: Why was there a dispute?
Self-contained rewrite: Why was there a dispute about Bobby Allison's car at the National 500?