Wood Bed Replacement

[Cops053]

Removed the old wood from the bed of my 66 SB, was not installed properly and was crappy looking. It was not bolted down the correct way, all pieces were just bolted to the crossmembers, and there were only 6 pieces. From lokking at illistrations from the different venders I see that there should be eight (8) pieces. Does anyone have the correct width measurement for the bed boards. I plan on making and replacing them myself. I came into some 7/8" x10" Oak Flooring that is in various lengths from 8' to 12 foot. Thanks in advance for and help.