OER Parts offers a wide selection of Car Care Products for your 1977 GMC G35. OER Parts offers 1977 GMC G35 Cleaning Supplies, 1977 GMC G35 Buckets, 1977 GMC G35 Grit Guard Basic Wash System 3.5 Gallon Black Pail With Yellow Lid, 1977 GMC G35 Grit Guard Basic Wash System 5 Gallon Yellow Pail With Black Lid, 1977 GMC G35 Universal Pad Cleaner, and 1977 GMC G35 Grit Guard Dual Bucket Washing System.