67-72 Chevy and GMC Fleetside 49.5-Inch Metal Floor Fleetside Reinforcement Strip 49.5-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. REINFORCEMENT STRIP 49.5 INCHES