Speaking with a fellow that is restoring a HQ Sandy Ute and he seemed to think his ute may originally had a coloured firewall instead of black its an early 74 build, this guy is no novice he has restored and owned many HQs including Sandmans and also said he had a HQ GTS that had a coloured firewall from factory I know in the past the subject has been raised how some plants did things differently, my Q has the chrome yellow under the black on the firewall but I imagine this was just in the assembly line paint the whole body then further down the black firewall was painted, has anyone and other evidence of either.