 The 1LE was simply an option combination, not a separate package or model that dealers were aware of the existence of, resulting in 111 cars built with 1LE equipment in 1989.The 1990 model year finished the lowest production to date (35,048), due to a truncated 1990 model run followed by the early introduction of the facelifted 1991 models.1990 also marked the final year for the IROC-Z; Chevrolet had decided not to renew its contract with the International Race of Champions.