Abstract: A show bar assembly for attachment to side panels of a pick-up truck or like vehicles capable of being adjusted and mounted on such vehicles of a plurality of different sizes and configurations and support a variety of automotive light accessories and the like at different locations as chosen by the owner. The show bar assembly comprises an upright front bar formed of three tubular members collectively forming an inverted U-shaped first bar unit to extend above the side panels of the truck and a second bar unit also collectively forming an inverted U-shaped angled bracing bar unit with the top section thereof immediately adjacent and paralleling the top section of the first bar unit. Each of these side tube sections of the first and second bar units have a mounting plate at the respective lower ends thereof for fixing the lower end portions thereof to truck side panels in deliberate mechanical tensioned relation minimizing vibration and looseness between component parts.