OER Parts offers a wide selection of Body Panels for your 1973 GMC K25/K2500 Suburban. OER Parts offers 1973 GMC K25/K2500 Suburban Full Firewall, 1973 GMC K25/K2500 Suburban Partial Firewall 1973 GMC K25/K2500 Suburban Firewall Body Mount Patch Panels, 1973 GMC K25/K2500 Suburban Firewall To Floor Braces, 1973 GMC K25/K2500 Suburban Firewall Extension, and 1973 GMC K25/K2500 Suburban Firewall Delete Plate.