OER Parts offers a wide selection of Sill Plates for your 1978 GMC Caballero. OER Parts offers 1978 GMC Caballero 2 Door Door Sill Plates, 1978 GMC Caballero 4 Door Door Sill Plate, 1978 GMC Caballero Billet Sill Plates, 1978 GMC Caballero ABS Sill Plates, 1978 GMC Caballero Chrome Sill Plates, 1978 GMC Caballero Aluminum Sill Plates, 1978 GMC Caballero Carbon Fiber Sill Plates, and 1978 GMC Caballero Sill Plate Screw Set.