Early hot rods often removed their fenders to reduce weight and create a lighter, more aggressive shape.
The practice grew from Southern California speed equipment culture in the late 1930s and 1940s. Builders modified inexpensive older Fords—especially Model Ts, Model As, and Model Bs—for dry-lake racing. Removing fenders, bumpers, windshields, hoods, and convertible tops shed unnecessary mass.
A fender is the body panel surrounding a wheel opening. A fenderless hot rod exposed its tires and suspension, producing the classic “high-boy” appearance. This was not merely cosmetic: less weight improved acceleration, while altered suspension and tires helped handling and traction.
The other options describe different parts. Grilles cover the radiator opening, running boards sit below the doors, and hubcaps attach to the wheels. None is the standard answer for the removable wheel-covering panels stripped from early hot rods.