ハンス＝ヨアヒム・スタック
In 1979, Procar constructor Project Four entered a car for Niki Lauda when he was not in the factory entries. Lauda won 3 races for P4, and the series, before retiring from F1 racing in late September. In 1980, Hans-Joachim Stuck won two events for P4, finishing 3rd overall.