57MK81S Right - Passenger Side Rocker Panel Backing Plate Fits 1975-1978 GMC C15

35BC38T Right - Passenger Side Rocker Panel Backing Plate Fits 1975-1978 GMC C15

For 1975-1978 GMC C15 Rocker Panel Backing Plate Right - Passenger Side 53238XT

Right - Passenger Side Rocker Panel Backing Plate For 1975-1978 GMC C15 GD163FW

For 1975-1986 Chevrolet K20 Rocker Panel Backing Plate 88164ZC

Right - Passenger Side Rocker Panel Backing Plate fits GMC C15 1975-1978 14XGBX

For 1973-1974 GMC C15/C1500 Pickup Rocker Panel Backing Plate 83724KX

For 1975-1978 GMC C25 Rocker Panel Backing Plate Right - Passenger Side 56175JM