Original 1979-82 GMC Chevy Truck Dealer Parts Catalog. This Parts Book covers the Medium Duty C5D, C6D & C7D Steel Conventional Models from this period and is dated June, 1986. This is what the Dealer used to order available Factory Replacement Parts to Repair your Truck. It has Part Numbers, Group Numbers, Description, Quantity and Application [No Illustrations]. It is in good condition with normal wear and soiling from use in a Dealership [see photos]. Pages are loose with no binder. Very rare and informative piece that will be a valuable tool for the GM Owner or Collector.