OER Parts offers a wide selection of Apparel for your 1981 GMC C3500. OER Parts offers 1981 GMC C3500 Caps, Hats, Beanies, 1981 GMC C3500 Casual Shirts, 1981 GMC C3500 Children's Wear, 1981 GMC C3500 Gloves, 1981 GMC C3500 Jackets, 1981 GMC C3500 Long Sleeve Shirts, 1981 GMC C3500 Pit Crew Shirts, 1981 GMC C3500 Polo Shirts, 1981 GMC C3500 Sweaters & Sweatshirts, 1981 GMC C3500 T-Shirts & Tanks, and 1981 GMC C3500 Women's Wear.