67-72 Chevy and GMC Fleetside 72-Inch Metal Floor Fleetside Reinforcement Strip 72-Inches. For Models: with Metal Bed Floor. These strips "reinforce" the bed but they do not attach to the frame. Trucks with a metal floors originally came equipped with two 49.5" strips and one 72" strips.67-72 Chevy & GMC Fleetside