Complete, gold anodized main spars are standard on the RV-3, RV-7/7A, RV-8/8A and RV-9A. A gold anodized fuselage center section bulkhead, precision matched to the main spars, is standard on those kits as well. RV-4 and RV-6/6A spars are a pre-drilled kit and require assembly, but complete anodized spars are available as an option.