OER Parts offers a wide selection of Aftermarket Starters for your 1991 GMC All Models. OER Parts offers 1991 GMC All Models MSD Dynaforce Starter, 1991 GMC All Models High Torque Gear Reduction Mini Starter, 1991 GMC All Models High Torque Small Case Starter, and 1991 GMC All Models Performance High Torque Starters.