Bed bottoms are 18Ga steel , the ribs are not exactly the same shape as original but it will fit the same. We  cut  them in 2 pieces after stamping them  to  make shipping easier and more affordable. You will need to weld the 2 pieces together in the middle. 
If you want it in one piece you can pick it up or arrange freight shipping on your own. 
 We can also stamp custom size pieces up to 104 inches long .