 The IROC-Z package proved popular and the package became standard on Z28s.This resulted with two models remaining, the base coupe and the IROC-Z.Without the Z28 to bridge the gap between the base Camaro and the flagship IROC-Z, the previously standard aluminum 16-inch 5-spoke wheels were now an option - "base" IROCs now got the previous year Z28's aluminum 15" 5-spoke wheels (which also became standard on the base coupes) and P215/65-15 tires.