AFAIK most 73/74 Pagewood HQs had a body-coloured firewalls. The inner guards & radiator support were still black.

They then went back to black firewalls for HJ/X/Z.

I've got 2 original HQ sedans in my shed, a Glacier White 72 Premier which has an all black underbonnet & a Saffron (Orange) late 73 Kingswood with a body-coloured firewall.

Dr Terry