OER 154983 Features:

Round plastic plug that seals the access hole in the end of the rocker panel on 1967-86 C/K, and 1987-91 R/V models. Plugging these holes can help prevent road salt, dirt, mud, and other debris from entering into the interior portion of the rocker panel, preventing or reducing the chance of corrosion of your rockers. Many truck owners prefer to coat the interior of the rocker panels with rust treatment or undercoat before selaing up the end of the rocker with this 1" diameter plug.